{"id":50970,"date":"2026-03-04T15:57:09","date_gmt":"2026-03-04T15:57:09","guid":{"rendered":"https:\/\/cymru.global\/uncategorized-cy\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\/"},"modified":"2026-03-04T15:57:21","modified_gmt":"2026-03-04T15:57:21","slug":"cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930","status":"publish","type":"post","link":"https:\/\/cymru.global\/cy\/uncategorized-cy\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\/","title":{"rendered":"&#8216;Cipian y Cestyll er Heddwch!&#8217; Sut y nododd Cymru 10fed Pen-blwydd Cynghrair y Cenhedloedd, 1930"},"content":{"rendered":"<div class=\"container\">\n<p>Un o&#8217;r nifer o &#8216;hanesion cudd&#8217; sydd heb eu harchwilio eto ymhlith Archifau Teml Undeb Cynghrair y Cenhedloedd Cymru &#8211; y mae llawer ohonynt yn cael eu cadw yn Llyfrgell Genedlaethol Cymru yn Aberystwyth &#8211; yw&#8217;r hanes diddorol o ymgyrch 10fed Pen-blwydd Cynghrair y Cenhedloedd Cymru, pan wnaeth ymgyrchwyr heddwch &#8216;ymosod ar gaerau&#8217; cestyll hanesyddol Cymru i&#8217;w hadennill yn enw heddwch.<\/p>\n<\/div><div class=\"container\">\n<p>Dros gyfnod haf 1930, cynhaliwyd amrywiaeth eang o ddigwyddiadau yn cynnwys miloedd yn  <\/p>\n<\/div><div class=\"container\">\n<ul class=\"wp-block-list\"><div class=\"container\">\n<li>Castell Harlech (Mai 10fed 1930)<\/li>\n<\/div>\n\n<div class=\"container\">\n<li>Castell Beamaris (17 Mai 1930)<\/li>\n<\/div>\n\n<div class=\"container\">\n<li>Castell Gwydir (5 Mehefin 1930)<\/li>\n<\/div>\n\n<div class=\"container\">\n<li>Castell Cricieth (6 Gorffennaf 1930)<\/li>\n<\/div>\n\n<div class=\"container\">\n<li>Castell Caernmarfon (25 Gorffennaf 1930)<\/li>\n<\/div><\/ul>\n<\/div><div class=\"container\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"824\" src=\"https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/Unbekannt_-_Harlech_Castle_Merionethshire_Wales_1894_-_MeisterDrucke-698250-1024x824.jpg\" alt=\"\" class=\"wp-image-45699\" srcset=\"https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/Unbekannt_-_Harlech_Castle_Merionethshire_Wales_1894_-_MeisterDrucke-698250-1024x824.jpg 1024w, https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/Unbekannt_-_Harlech_Castle_Merionethshire_Wales_1894_-_MeisterDrucke-698250-800x644.jpg 800w, https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/Unbekannt_-_Harlech_Castle_Merionethshire_Wales_1894_-_MeisterDrucke-698250-300x241.jpg 300w, https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/Unbekannt_-_Harlech_Castle_Merionethshire_Wales_1894_-_MeisterDrucke-698250-768x618.jpg 768w, https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/Unbekannt_-_Harlech_Castle_Merionethshire_Wales_1894_-_MeisterDrucke-698250-1x1.jpg 1w, https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/Unbekannt_-_Harlech_Castle_Merionethshire_Wales_1894_-_MeisterDrucke-698250.jpg 1260w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><strong>Castell Harlech<\/strong> yn y 1920au, lle lansiwyd ymgyrch 10fed Pen-blwydd WLNU<\/figcaption><\/figure>\n<\/div><div class=\"container\">\n<p>O <a href=\"https:\/\/www.peoplescollection.wales\/items\/1162356\">Adroddiad Blynyddol Undeb Cynghrair y Cenhedloedd Cymru ym 1931<\/a> , ymhlith y casgliadau a ddigidwyd ar Gasgliad y Werin Cymru, cynigir y stori ganlynol am yr ymgyrch:<\/p>\n<\/div><div class=\"container\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"411\" src=\"https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/IMG_20190719_113433-1024x411.jpg\" alt=\"\" class=\"wp-image-45703\" srcset=\"https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/IMG_20190719_113433-1024x411.jpg 1024w, https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/IMG_20190719_113433-800x321.jpg 800w, https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/IMG_20190719_113433-300x120.jpg 300w, https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/IMG_20190719_113433-768x308.jpg 768w, https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/IMG_20190719_113433-1536x616.jpg 1536w, https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/IMG_20190719_113433-2x1.jpg 2w, https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/IMG_20190719_113433.jpg 1884w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div><div class=\"container\">\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1280\" height=\"1920\" src=\"https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/IMG_20190719_113443.jpg\" alt=\"\" class=\"wp-image-45705\" srcset=\"https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/IMG_20190719_113443.jpg 1280w, https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/IMG_20190719_113443-800x1200.jpg 800w, https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/IMG_20190719_113443-200x300.jpg 200w, https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/IMG_20190719_113443-768x1152.jpg 768w, https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/IMG_20190719_113443-1024x1536.jpg 1024w, https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/IMG_20190719_113443-683x1024.jpg 683w, https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/IMG_20190719_113443-1x1.jpg 1w\" sizes=\"(max-width: 1280px) 100vw, 1280px\" \/><\/figure>\n<\/div><div class=\"container\">\n<p><\/p>\n<\/div><div class=\"container\">\n<h2 class=\"wp-block-heading\">Sgript sydd wedi Goroesi o Orsedd Heddwch 1930 gan Cynan<\/h2>\n<\/div><div class=\"container\">\n<figure class=\"wp-block-embed is-type-rich is-provider-flickr wp-block-embed-flickr\"><div class=\"wp-block-embed__wrapper\">\n<a data-flickr-embed='true' href='https:\/\/www.flickr.com\/photos\/129767871@N03\/albums\/72157670526417283\/' title='Cynan - Caernarfon Pageant of War and Peace by CymrudrosHeddwch - WalesforPeace, on Flickr'><img src='https:\/\/live.staticflickr.com\/8435\/29226802042_f7d33a7a99_c.jpg' width='800' height='600' alt='Cynan - a Pageant of War &amp; Peace, 1930, Caernarfon Castle'><\/a><script async src='https:\/\/embedr.flickr.com\/assets\/client-code.js' charset='utf-8'><\/script>\n<\/div><figcaption class=\"wp-element-caption\">Cliciwch DH \/ LH i archwilio sgript a storifwrdd &#8216;Pageant of War &amp; Peace&#8217; Cynan, a ysgrifennwyd yn arbennig ar gyfer y lleoliad yng Nghastell Caernarfon.<\/figcaption><\/figure>\n<\/div><div class=\"container\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"750\" src=\"https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/Caernarfon-Castle-Pageant-of-War-and-Peace-by-Cynan-2-1024x750.jpg\" alt=\"\" class=\"wp-image-45701\" srcset=\"https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/Caernarfon-Castle-Pageant-of-War-and-Peace-by-Cynan-2-1024x750.jpg 1024w, https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/Caernarfon-Castle-Pageant-of-War-and-Peace-by-Cynan-2-800x586.jpg 800w, https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/Caernarfon-Castle-Pageant-of-War-and-Peace-by-Cynan-2-300x220.jpg 300w, https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/Caernarfon-Castle-Pageant-of-War-and-Peace-by-Cynan-2-768x562.jpg 768w, https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/Caernarfon-Castle-Pageant-of-War-and-Peace-by-Cynan-2-1536x1125.jpg 1536w, https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/Caernarfon-Castle-Pageant-of-War-and-Peace-by-Cynan-2-1x1.jpg 1w, https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/Caernarfon-Castle-Pageant-of-War-and-Peace-by-Cynan-2.jpg 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div><div class=\"container\">\n<p>Delwedd o <a href=\"https:\/\/www.flickr.com\/photos\/129767871@N03\/albums\/72157670526417283\/\">Orsaf Heddwch Castell Caernarfon<\/a> yn cael ei pherfformio, wedi&#8217;i hysgrifennu gan y <a href=\"https:\/\/en.wikipedia.org\/wiki\/Albert_Evans-Jones\">bardd Cymreig Cynan<\/a> .<\/p>\n<\/div><div class=\"container\">\n<p><\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Un o&#8217;r nifer o &#8216;hanesion cudd&#8217; sydd heb eu harchwilio eto ymhlith Archifau Teml Undeb Cynghrair y Cenhedloedd Cymru &#8211; y mae llawer ohonynt yn cael eu cadw yn Llyfrgell Genedlaethol Cymru yn Aberystwyth &#8211; yw&#8217;r hanes diddorol o ymgyrch 10fed Pen-blwydd Cynghrair y Cenhedloedd Cymru, pan wnaeth ymgyrchwyr heddwch [&#8230;]<\/p>\n","protected":false},"author":7,"featured_media":45700,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"iawp_total_views":1,"footnotes":""},"categories":[2],"tags":[],"class_list":["post-50970","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized-cy"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>&#039;Cipian y Cestyll er Heddwch!&#039; Sut y nododd Cymru 10fed Pen-blwydd Cynghrair y Cenhedloedd, 1930 - Cymru Global<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"cy_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"&#039;Cipian y Cestyll er Heddwch!&#039; Sut y nododd Cymru 10fed Pen-blwydd Cynghrair y Cenhedloedd, 1930 - Cymru Global\" \/>\n<meta property=\"og:description\" content=\"Un o&#8217;r nifer o &#8216;hanesion cudd&#8217; sydd heb eu harchwilio eto ymhlith Archifau Teml Undeb Cynghrair y Cenhedloedd Cymru &#8211; y mae llawer ohonynt yn cael eu cadw yn Llyfrgell Genedlaethol Cymru yn Aberystwyth &#8211; yw&#8217;r hanes diddorol o ymgyrch 10fed Pen-blwydd Cynghrair y Cenhedloedd Cymru, pan wnaeth ymgyrchwyr heddwch [...]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/cymru.global\/cy\/uncategorized-cy\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\/\" \/>\n<meta property=\"og:site_name\" content=\"Cymru Global\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/welshcentreforinternationalaffairs\/\" \/>\n<meta property=\"article:published_time\" content=\"2026-03-04T15:57:09+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-03-04T15:57:21+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/Unbekannt_-_Harlech_Castle_Merionethshire_Wales_1894_-_MeisterDrucke-698250.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1260\" \/>\n\t<meta property=\"og:image:height\" content=\"1014\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Craig Owen\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@WCIA_Wales\" \/>\n<meta name=\"twitter:site\" content=\"@WCIA_Wales\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Craig Owen\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/cymru.global\\\/cy\\\/uncategorized-cy\\\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/cymru.global\\\/cy\\\/uncategorized-cy\\\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\\\/\"},\"author\":{\"name\":\"Craig Owen\",\"@id\":\"https:\\\/\\\/cymru.global\\\/cy\\\/#\\\/schema\\\/person\\\/b4a3bb351a6e3c07121e207a47e2b1ab\"},\"headline\":\"&#8216;Cipian y Cestyll er Heddwch!&#8217; Sut y nododd Cymru 10fed Pen-blwydd Cynghrair y Cenhedloedd, 1930\",\"datePublished\":\"2026-03-04T15:57:09+00:00\",\"dateModified\":\"2026-03-04T15:57:21+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/cymru.global\\\/cy\\\/uncategorized-cy\\\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\\\/\"},\"wordCount\":202,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/cymru.global\\\/cy\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/cymru.global\\\/cy\\\/uncategorized-cy\\\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/cymru.global\\\/wp-content\\\/uploads\\\/2025\\\/09\\\/Unbekannt_-_Harlech_Castle_Merionethshire_Wales_1894_-_MeisterDrucke-698250.jpg\",\"articleSection\":[\"Uncategorized @cy\"],\"inLanguage\":\"cy-GB\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/cymru.global\\\/cy\\\/uncategorized-cy\\\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/cymru.global\\\/cy\\\/uncategorized-cy\\\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\\\/\",\"url\":\"https:\\\/\\\/cymru.global\\\/cy\\\/uncategorized-cy\\\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\\\/\",\"name\":\"'Cipian y Cestyll er Heddwch!' Sut y nododd Cymru 10fed Pen-blwydd Cynghrair y Cenhedloedd, 1930 - Cymru Global\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/cymru.global\\\/cy\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/cymru.global\\\/cy\\\/uncategorized-cy\\\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/cymru.global\\\/cy\\\/uncategorized-cy\\\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/cymru.global\\\/wp-content\\\/uploads\\\/2025\\\/09\\\/Unbekannt_-_Harlech_Castle_Merionethshire_Wales_1894_-_MeisterDrucke-698250.jpg\",\"datePublished\":\"2026-03-04T15:57:09+00:00\",\"dateModified\":\"2026-03-04T15:57:21+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/cymru.global\\\/cy\\\/uncategorized-cy\\\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\\\/#breadcrumb\"},\"inLanguage\":\"cy-GB\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/cymru.global\\\/cy\\\/uncategorized-cy\\\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"cy-GB\",\"@id\":\"https:\\\/\\\/cymru.global\\\/cy\\\/uncategorized-cy\\\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\\\/#primaryimage\",\"url\":\"https:\\\/\\\/cymru.global\\\/wp-content\\\/uploads\\\/2025\\\/09\\\/Unbekannt_-_Harlech_Castle_Merionethshire_Wales_1894_-_MeisterDrucke-698250.jpg\",\"contentUrl\":\"https:\\\/\\\/cymru.global\\\/wp-content\\\/uploads\\\/2025\\\/09\\\/Unbekannt_-_Harlech_Castle_Merionethshire_Wales_1894_-_MeisterDrucke-698250.jpg\",\"width\":1260,\"height\":1014},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/cymru.global\\\/cy\\\/uncategorized-cy\\\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Cartref\",\"item\":\"https:\\\/\\\/cymru.global\\\/cy\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"&#8216;Cipian y Cestyll er Heddwch!&#8217; Sut y nododd Cymru 10fed Pen-blwydd Cynghrair y Cenhedloedd, 1930\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/cymru.global\\\/cy\\\/#website\",\"url\":\"https:\\\/\\\/cymru.global\\\/cy\\\/\",\"name\":\"Cymru Global\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\\\/\\\/cymru.global\\\/cy\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/cymru.global\\\/cy\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"cy-GB\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/cymru.global\\\/cy\\\/#organization\",\"name\":\"Cymru Global\",\"url\":\"https:\\\/\\\/cymru.global\\\/cy\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"cy-GB\",\"@id\":\"https:\\\/\\\/cymru.global\\\/cy\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/cymru.global\\\/wp-content\\\/uploads\\\/2026\\\/02\\\/loog-white.svg\",\"contentUrl\":\"https:\\\/\\\/cymru.global\\\/wp-content\\\/uploads\\\/2026\\\/02\\\/loog-white.svg\",\"width\":179,\"height\":59,\"caption\":\"Cymru Global\"},\"image\":{\"@id\":\"https:\\\/\\\/cymru.global\\\/cy\\\/#\\\/schema\\\/logo\\\/image\\\/\"},\"sameAs\":[\"https:\\\/\\\/www.facebook.com\\\/welshcentreforinternationalaffairs\\\/\",\"https:\\\/\\\/x.com\\\/WCIA_Wales\",\"https:\\\/\\\/www.instagram.com\\\/wcia_wales\\\/?hl=en-gb\",\"https:\\\/\\\/www.youtube.com\\\/channel\\\/UC0G2l7QV_yPDU4RHB8hEEPg\"]},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/cymru.global\\\/cy\\\/#\\\/schema\\\/person\\\/b4a3bb351a6e3c07121e207a47e2b1ab\",\"name\":\"Craig Owen\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"cy-GB\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/ddf69d48b620ba56dc5e9645bb2b3b54243829f3e133aaad1d2f65e0ae3d7d0c?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/ddf69d48b620ba56dc5e9645bb2b3b54243829f3e133aaad1d2f65e0ae3d7d0c?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/ddf69d48b620ba56dc5e9645bb2b3b54243829f3e133aaad1d2f65e0ae3d7d0c?s=96&d=mm&r=g\",\"caption\":\"Craig Owen\"},\"url\":\"https:\\\/\\\/cymru.global\\\/cy\\\/author\\\/craig-owen\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"'Cipian y Cestyll er Heddwch!' Sut y nododd Cymru 10fed Pen-blwydd Cynghrair y Cenhedloedd, 1930 - Cymru Global","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"og_locale":"cy_GB","og_type":"article","og_title":"'Cipian y Cestyll er Heddwch!' Sut y nododd Cymru 10fed Pen-blwydd Cynghrair y Cenhedloedd, 1930 - Cymru Global","og_description":"Un o&#8217;r nifer o &#8216;hanesion cudd&#8217; sydd heb eu harchwilio eto ymhlith Archifau Teml Undeb Cynghrair y Cenhedloedd Cymru &#8211; y mae llawer ohonynt yn cael eu cadw yn Llyfrgell Genedlaethol Cymru yn Aberystwyth &#8211; yw&#8217;r hanes diddorol o ymgyrch 10fed Pen-blwydd Cynghrair y Cenhedloedd Cymru, pan wnaeth ymgyrchwyr heddwch [...]","og_url":"https:\/\/cymru.global\/cy\/uncategorized-cy\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\/","og_site_name":"Cymru Global","article_publisher":"https:\/\/www.facebook.com\/welshcentreforinternationalaffairs\/","article_published_time":"2026-03-04T15:57:09+00:00","article_modified_time":"2026-03-04T15:57:21+00:00","og_image":[{"width":1260,"height":1014,"url":"https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/Unbekannt_-_Harlech_Castle_Merionethshire_Wales_1894_-_MeisterDrucke-698250.jpg","type":"image\/jpeg"}],"author":"Craig Owen","twitter_card":"summary_large_image","twitter_creator":"@WCIA_Wales","twitter_site":"@WCIA_Wales","twitter_misc":{"Written by":"Craig Owen","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/cymru.global\/cy\/uncategorized-cy\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\/#article","isPartOf":{"@id":"https:\/\/cymru.global\/cy\/uncategorized-cy\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\/"},"author":{"name":"Craig Owen","@id":"https:\/\/cymru.global\/cy\/#\/schema\/person\/b4a3bb351a6e3c07121e207a47e2b1ab"},"headline":"&#8216;Cipian y Cestyll er Heddwch!&#8217; Sut y nododd Cymru 10fed Pen-blwydd Cynghrair y Cenhedloedd, 1930","datePublished":"2026-03-04T15:57:09+00:00","dateModified":"2026-03-04T15:57:21+00:00","mainEntityOfPage":{"@id":"https:\/\/cymru.global\/cy\/uncategorized-cy\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\/"},"wordCount":202,"commentCount":0,"publisher":{"@id":"https:\/\/cymru.global\/cy\/#organization"},"image":{"@id":"https:\/\/cymru.global\/cy\/uncategorized-cy\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\/#primaryimage"},"thumbnailUrl":"https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/Unbekannt_-_Harlech_Castle_Merionethshire_Wales_1894_-_MeisterDrucke-698250.jpg","articleSection":["Uncategorized @cy"],"inLanguage":"cy-GB","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/cymru.global\/cy\/uncategorized-cy\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/cymru.global\/cy\/uncategorized-cy\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\/","url":"https:\/\/cymru.global\/cy\/uncategorized-cy\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\/","name":"'Cipian y Cestyll er Heddwch!' Sut y nododd Cymru 10fed Pen-blwydd Cynghrair y Cenhedloedd, 1930 - Cymru Global","isPartOf":{"@id":"https:\/\/cymru.global\/cy\/#website"},"primaryImageOfPage":{"@id":"https:\/\/cymru.global\/cy\/uncategorized-cy\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\/#primaryimage"},"image":{"@id":"https:\/\/cymru.global\/cy\/uncategorized-cy\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\/#primaryimage"},"thumbnailUrl":"https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/Unbekannt_-_Harlech_Castle_Merionethshire_Wales_1894_-_MeisterDrucke-698250.jpg","datePublished":"2026-03-04T15:57:09+00:00","dateModified":"2026-03-04T15:57:21+00:00","breadcrumb":{"@id":"https:\/\/cymru.global\/cy\/uncategorized-cy\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\/#breadcrumb"},"inLanguage":"cy-GB","potentialAction":[{"@type":"ReadAction","target":["https:\/\/cymru.global\/cy\/uncategorized-cy\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\/"]}]},{"@type":"ImageObject","inLanguage":"cy-GB","@id":"https:\/\/cymru.global\/cy\/uncategorized-cy\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\/#primaryimage","url":"https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/Unbekannt_-_Harlech_Castle_Merionethshire_Wales_1894_-_MeisterDrucke-698250.jpg","contentUrl":"https:\/\/cymru.global\/wp-content\/uploads\/2025\/09\/Unbekannt_-_Harlech_Castle_Merionethshire_Wales_1894_-_MeisterDrucke-698250.jpg","width":1260,"height":1014},{"@type":"BreadcrumbList","@id":"https:\/\/cymru.global\/cy\/uncategorized-cy\/cipian-y-cestyll-er-heddwch-sut-y-nododd-cymru-10fed-pen-blwydd-cynghrair-y-cenhedloedd-1930\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Cartref","item":"https:\/\/cymru.global\/cy\/"},{"@type":"ListItem","position":2,"name":"&#8216;Cipian y Cestyll er Heddwch!&#8217; Sut y nododd Cymru 10fed Pen-blwydd Cynghrair y Cenhedloedd, 1930"}]},{"@type":"WebSite","@id":"https:\/\/cymru.global\/cy\/#website","url":"https:\/\/cymru.global\/cy\/","name":"Cymru Global","description":"","publisher":{"@id":"https:\/\/cymru.global\/cy\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/cymru.global\/cy\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"cy-GB"},{"@type":"Organization","@id":"https:\/\/cymru.global\/cy\/#organization","name":"Cymru Global","url":"https:\/\/cymru.global\/cy\/","logo":{"@type":"ImageObject","inLanguage":"cy-GB","@id":"https:\/\/cymru.global\/cy\/#\/schema\/logo\/image\/","url":"https:\/\/cymru.global\/wp-content\/uploads\/2026\/02\/loog-white.svg","contentUrl":"https:\/\/cymru.global\/wp-content\/uploads\/2026\/02\/loog-white.svg","width":179,"height":59,"caption":"Cymru Global"},"image":{"@id":"https:\/\/cymru.global\/cy\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/welshcentreforinternationalaffairs\/","https:\/\/x.com\/WCIA_Wales","https:\/\/www.instagram.com\/wcia_wales\/?hl=en-gb","https:\/\/www.youtube.com\/channel\/UC0G2l7QV_yPDU4RHB8hEEPg"]},{"@type":"Person","@id":"https:\/\/cymru.global\/cy\/#\/schema\/person\/b4a3bb351a6e3c07121e207a47e2b1ab","name":"Craig Owen","image":{"@type":"ImageObject","inLanguage":"cy-GB","@id":"https:\/\/secure.gravatar.com\/avatar\/ddf69d48b620ba56dc5e9645bb2b3b54243829f3e133aaad1d2f65e0ae3d7d0c?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/ddf69d48b620ba56dc5e9645bb2b3b54243829f3e133aaad1d2f65e0ae3d7d0c?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/ddf69d48b620ba56dc5e9645bb2b3b54243829f3e133aaad1d2f65e0ae3d7d0c?s=96&d=mm&r=g","caption":"Craig Owen"},"url":"https:\/\/cymru.global\/cy\/author\/craig-owen\/"}]}},"_links":{"self":[{"href":"https:\/\/cymru.global\/cy\/wp-json\/wp\/v2\/posts\/50970","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cymru.global\/cy\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cymru.global\/cy\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cymru.global\/cy\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/cymru.global\/cy\/wp-json\/wp\/v2\/comments?post=50970"}],"version-history":[{"count":1,"href":"https:\/\/cymru.global\/cy\/wp-json\/wp\/v2\/posts\/50970\/revisions"}],"predecessor-version":[{"id":50971,"href":"https:\/\/cymru.global\/cy\/wp-json\/wp\/v2\/posts\/50970\/revisions\/50971"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cymru.global\/cy\/wp-json\/wp\/v2\/media\/45700"}],"wp:attachment":[{"href":"https:\/\/cymru.global\/cy\/wp-json\/wp\/v2\/media?parent=50970"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cymru.global\/cy\/wp-json\/wp\/v2\/categories?post=50970"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cymru.global\/cy\/wp-json\/wp\/v2\/tags?post=50970"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}