The stronger kingdoms often took control of the Northumbria weaker kingdoms. By around AD 600 the five Mercia East main Anglo-Saxon Anglia kingdoms were Northumbria, Wessex Kent Mercia,Wessex,Kent and Anglia.➢ The stronger kingdoms often took control of the weaker kingdoms. ➢ By around AD 600 the five main Anglo-Saxon kingdoms were Northumbria, Mercia, Wessex, Kent and Anglia