 After he died in 1477, the War of the Burgundian Succession broke out, during which his daughter Mary married Maximilian of Austria; thus all Burgundian possessions were acquired by the Habsburgs.However, States of Guelders exploited the confusion to declare independence and proclaim Charles II, son of Adolf, as the new Guelderian duke, with his aunt Catherine as regent.This Guelderian War of Independence (1477–1499) ended in a Habsburg defeat, and Charles II firmly established his reign with the support of Kingdom of France.