https://brwydr.blogspot.com/2019/07/mystery-of-y-croes-naid-icon-of-welsh.html
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RHYS AP GRUFFYDD A FORGOTTEN WELSH REBELLION
http://welshremembrancer.blogspot.com/2008/12/last-prince-of-wales-rhys-ap-gruffydd.html
To Inform and educate on the Royal Houses of Wales 'Teyrnasoed Brenhinol Cymru'; Aberffraw - Gwynedd, Mathhrafel - Powys, Dinefwr - Deheubarth and Dinas Powys - Glywysing. Covering the period from Caradog 47 - 50 AD to Maredudd ab Owain 1417 - 1422 and Rhys III 1531.