sentences:  There are mentions of Brycheiniog and Gwrtheyrnion (near Buellt) in that era, but for the latter it is difficult to say whether it had either an earlier or a later existence.The early history in the north and east are somewhat better known, with Gwynedd having a semi-legendary origin in the arrival of Cunedda from Manau Gododdin in the fifth century (an inscribed sixth century gravestone records the earliest known mention of the kingdom).Its king Maelgwn Gwynedd was one of the kings condemned by Gildas in his "De Excidio et Conquestu Britanniae", c. 540.