sentences:  Its king Vortiporius was one of the kings condemned by Gildas in his "De Excidio et Conquestu Britanniae", c. 540.While the better documented southeast shows a long and slow acquisition of property and power by the dynasty of Meurig ap Tewdrig in connection with the kingdoms of Glywysing, Gwent and Ergyng, there is a near-complete absence of information about many other areas.The earliest known name of a king of Ceredigion was Cereticiaun, who died in 807, and none of the mid-Welsh kingdoms can be evidenced before the eighth century.