 In the Post-Roman period the traditional division into Angles, Saxons and Jutes (Anglo-Saxons) is first seen in the "Historia ecclesiastica gentis Anglorum" by Bede, however historical and archæological research has shown that a wider range of Germanic peoples from the coast of Frisia, Lower Saxony, Jutland and Southern Sweden also moved to Britain in this era.After the withdrawal of the last Roman soldiers from Britain in the early 5th century, the number of newcomers increased, and it is speculated that relations with the ruling Romanised Britons became strained.By about 449, open conflict had broken out, and the immigrants began to establish their own kingdoms in what would eventually become the Heptarchy.