Deira was an area of Post-Roman Britain, and a later Anglian kingdom.

The Angles were one of the main Germanic peoples who settled in Great Britain in the post-Roman period. They founded several kingdoms of the Heptarchy in Anglo-Saxon England. Their name, which derives from the Anglia Peninsula, is the root of the name England. According to Tacitus, writing around 100 AD, a people known as Angles (Anglii) lived east of the Lombards and Semnones, who lived near the Elbe river.