The Angles were a Germanic tribe that originated in Angeln, Schleswig-Holstein, Denmark. The Angles' stronghold was Angulus, and they had a strong tradition of service as Roman foederati. The Angles would migrate to Roman-ruled Britain during the late 4th century, choosing to turn on their employers and call more of their people to settle on Britain. By 481, they had two main outposts on the isle, at Linnuis and Iceni, but they were separated by territory tsill in British hands. More and more warriors arrived from the mainland over the years, and they went to war with the kingdoms of Ebrauc and Elmet. The Angles conquered these Romano-British kingdoms founded their own kingdoms of Northumbria, East Anglia, and Mercia. In the 10th century, the Angles would be assimilated into the new "English" culture with the Saxons; "English" comes from the word "Aenglisc" (meaning "Angle"), while "England" comes from the word "Angle-lond" ("Land of the Angles").