The area experienced a depopulation during the fourth century, possibly due to raids from Saxons and Picts. Around 410 AD, Germanic-speaking settlers began to arrive from north-west Europe, thus placing the first phases of the Anglo-Saxon settlement of Norfolk before the supposed landing of Hengist and Horsa in Kent in 449. The migration here likely occurred on a very large scale; however, archaeologist Toby Martin has stressed that the settlers did not arrive as part of a coherent tribal group, and that the self-identification of the people of the region as Angles seems to have emerged from a later period of ethnogenesis.