Deira

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For other uses, see Deira (disambiguation).

Deira (which later absorbed Brythonic kingdom of Ebrauc) was a kingdom in England during the 6th century AD. It later merged with the kingdom of Bernicia (Brythonic, Brynaich) to the north to form the kingdom of Northumbria. The name of the kingdom is of Brythonic language origin, perhaps from Deifr, meaning "waters", or from Daru, meaning "oak", in which case it would mean "the people of the Derwent", a derivation also found in the Latin name for Malton, Derventio.

According to Simeon of Durham it extended from the Humber to the Tyne, but the land was waste north of the Tees. After the Kingdom of Ebrauc was annexed by Edwin, York (Ebrauc) became its capital. Before this it is likely that the capital would have been at or near Pocklington.

The first Anglian king of whom we have any record is Ælla, who flourished in the later 6th century after conquering the realm from the Britons in 581. After his death, Deira was subject to king Æthelfrith of Bernicia, who united the two kingdoms into Northumbria. Æthelfrith ruled until the accession of Ælla's son Edwin, in 616 or 617, who also ruled both kingdoms until 633.

Osric, the nephew of Edwin, ruled Deira after Edwin, but his son Oswine was put to death by Oswiu in 651. For a few years subsequently Deira was governed by Æthelwald son of Oswald of Bernicia.

Bede wrote of Deira in his Historia Ecclesiastica.

For a list of the kings of Deira, see: List of monarchs of Northumbria.