The entry of the Anglo-Saxon peoples into Britain, and their centuries-long successful struggle to establish Germanic kingdoms there, is among the most famous ventures of the Age of Migrations, but like other historical events of the time it is obscure in much of its detail: the identity and place of origin of the peoples taking part, the needs and desires that moved them to entry" and conquest, the lines of invasion, the duration of native resistance, the historicity of the British Arthur （亚瑟王）.