Before the Kingdom of England was established as a united entity, there were various kingdoms in the area—of which the main seven were known as the heptarchy. These were Wessex, Mercia, Northumbria (which also extended into present-day Scotland and originally formed from the earlier kingdoms of Deira and Bernicia), East Anglia (formed from the union of the early kingdoms of Suffolk and Norfolk), Sussex, Kent, and Essex. Other small Anglo-Saxon kingdoms existed at various points, including Hwicce, Lindsey (which survived as the Parts of Lindsey, Lincolnshire) and the Wihtwara (Isle of Wight). These are commonly referred to as "petty kingdoms".[2][4][3][5]
Bernicia (also extended into modern England; conquered the former Gododdin territory)
Northumbria (formed from the union of Bernicia with the more southerly Deira; later controlled territory further west upon the incorporation of Rheged)
12John Hines (2003). "Cultural Change and Social Organisation in Early Anglo-Saxon England". In Ausenda, Giorgio (ed.). After Empire: Towards an Ethnology of Europe's Barbarians. Boydell & Brewer. p.82. ISBN9780851158532. It is hard, in fact, even to find a satisfactory terminology for the political units we can imagine the early Anglo-Saxons to have had. Tribe, petty kingdom and kingdom are the terms most commonly used.
↑Hopkins, Daniel J.; Staff, Merriam-webster (1997). Merriam-Webster's Geographical Dictionary. Merriam-Webster. p.1223. ISBN978-0-87779-546-9. S Britain (except Wales and Strathclyde) divided into a number of petty kingdoms incl. the so-called Heptarchy
↑Forsyth, "Lost Pictish Source", Watson, Celtic Place Names, pp. 108–109.
↑Bruford, "What happened to the Caledonians", Watson, Celtic Place Names, pp. 108–113.