The Heptarchy is a collective name applied to the seven kingdoms of Anglo-Saxon England from the Anglo-Saxon settlement of Britain in the 5th century until the 8th century consolidation into the four kingdoms of Mercia, Northumbria, Wessex and East Anglia.. The term 'Heptarchy' (from the Greek ἑπταρχία, 'heptarchia'; from ἑπτά, 'hepta': "seven"; ἀρχή, 'arche': "reign, rule ...