 One of the earliest works by bard Iolo Goch was based on Tudur Hen , as Iolo may have studied at the Bangor priory . Tudur Hen 's most significant legacy was his name itself . The naming practice of the time in Wales was to attach the father 's surname to the new first name , hence his son being named Goronwy ap Tudur Hen . Goronwy had children , one of which was named Tudur , becoming a second Tudur ap Goronwy . The younger Tudur was noticed by King Edward III of England and was made a knight in his service , and he was the grandfather ( through Maredudd ap Tudur ) to Owain ap Maredudd ap Tudur . Owain anglicised his name to become Owen Tudor , and was the grandfather of King Henry VII of England , the founder of the Royal House of Tudor . 
