500 Beginning of Heptarchy

The Heptarchy (from the Greek hepta, "seven" and arkho, "to rule") is a collective name applied to the Anglo-Saxon kingdoms of south, east, and central England 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. The term has been in use since the 16th century, but the initial idea that there were seven Anglo-Saxon kingdoms is attributed to the English historian Henry of Huntingdon in the 12th century and was first used in his Historia Anglorum.