Royal coat of arms of the United Kingdom Wales is represented in the English coat of arms. However the argument is somewhat disengenuous as in 1535 the Welsh Dragon was already part of the Tudor Coat of Arms. Upon the accession of the Tudor monarchs, who were themselves of Welsh descent, a Welsh Dragon was used as a supporter on the Royal Arms. This was dropped by their successors, the Scottish House of Stuart, who replaced the Tudors' dragon supporter with the Scottish unicorn. In the 20th century, the arms of the principality of Wales were added as an inescutcheon to the coat of arms of the Prince
Tudors of Penmynydd the Great and later his son Dafydd ap Llywelyn. He claimed descent from Marchudd ap Cynan, Lord of Rhos and 'protector' of Rhodri the Great, king of Gwynedd, a founder of one of the so-called Fifteen Tribes of Wales. From Ednyfed's many sons would come a 'ministerial aristocracy' in northern Wales. He left the manors of Trecastell, Penmynydd and Erddreiniogin, Anglesey to those of his sons born to his second marriage to Gwenllian, daughter of king Rhys ap Gruffydd of Deheubarth, and among these sons was Goronwy (died 1268), founder of the line of the Tudors of Penmynyth. Goronwy served