Heptarchy

The Heptarchy (Greek: ἑπτά + ἀρχή seven + realm) is a collective name applied to the Anglo-Saxon kingdoms of south, east, and central Great Britain during late antiquity and the early Middle Ages, conventionally identified as seven: Northumbria, Mercia, East Anglia, Essex, Kent, Sussex and Wessex. The Anglo-Saxon kingdoms eventually unified into the Kingdom of England.