According to some sources the first ruler to assume the title Rex Anglorum is said to have been Offa in 774. who had been King of Mercia since 757. Wife, Cynethryth & had five children. 29 July 796 Died at the age of about 60.
Kings of Bernicia - Bernicia (Old English: Bernice) was an Anglo-Saxon kingdom established by Anglian settlers of the 6th century in what is now southeastern Scotland and North East England. In the early 7th century, it merged with its southern neighbour, Deira, to form the kingdom of Northumbria and its borders subsequently expanded considerably.