sentences:  After his betrayal and death at the hands of his own men, Wales fell into civil war from other leaders seeking to fill the void of power and become king.Gruffydd ap Llywelyn was referred to as King of Wales or "Rex Walensium" by John of Worcester.He was the last of a long line of paramount rulers among the insular Britons to have the title of King of the Britons bestowed upon him, and possibly the only one to truly rule over all the (independent) Britons.