In 468 they attacked and defeated the Suevi, who had occupied Roman Gallaecia and were threatening to expand. The Visigoths ended the Roman administration in Spain in 473, and their overlordship of most of the eastern and central peninsula was established by 476. A large-scale migration of the Visigoths into Iberia began in 494 under Alaric II, and it became the seat of their power after they lost most of their territory in Gaul to the Franks after the Battle of Vouillé in 507.