Glendower, Owen (1359?-1416?), was a Welsh prince who led his country against English domination. In 1402, he captured Sir Edmund Mortimer, whose family had strong claims on the English throne. Henry IV was slow to respond to the ransom demands, and Glendower won Mortimer over and married him to one of his daughters. In 1403, Sir Henry Percy, the Earl of Northumberland, and the Earl of Worcester joined Glendower in a plot to dethrone Henry and put a Mortimer on the throne. The Battle of Shrewsbury shattered their plans. Glendower's birthplace was probably Glyndyfrdwy, in North Wales. In 1405, at the height of his power, Glendower controlled North Wales and much of South Wales. By 1409, he was no longer a threat to Henry. The Welsh form of Glendower's name is Owain Glyn Dwr.