Roman Britain was in a state of political and economic collapse at the time of the Roman departure c. 400. A series of settlements (traditionally referred to as an invasion) by Germanic peoples began in the early fifth century, and by the sixth century the island would consist of many small kingdoms engaged in ongoing warfare with each other. The Germanic kingdoms are now collectively referred to as Anglo-Saxons. Christianity began to take hold among the Anglo-Saxons in the sixth century, with 597 given as the traditional date for its large-scale adoption.