Deira, an ancient Anglian kingdom, extending from the Tees to the Humber, and westwards to the borders of Cumbria. With its northern neighbour, Bernicia, it was afterwards merged in the kingdom of Northumbria, but later both were earldoms under the West Saxon kings.
Deira
Chambers's Encyclopaedia, Volume 3: Catarrh to Dion, p. 735
Source scan(s): p. 0746