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William III was the Prince of Orange from his birth, Stadtholder of the main provinces of the Dutch Republic from 28 June 1672, King of England and King of Ireland from 13 February 1689, and King of Scots (under the name William II) from 11 April 1689, until his death.
Born a member of the House of Orange-Nassau, William III won the English, Scottish and Irish Crowns following the Glorious Revolution, during which his uncle and father-in-law, the Catholic James II (VII in Scotland)), was deposed. In England, Scotland and Ireland, William ruled jointly with his wife, Mary II, until her death on 28 December 1694. He reigned as 'William II' in Scotland, but 'William III' in England and Ireland. Often he is referred to as William of Orange, a name he shared with many other historical figures. In Northern Ireland and Scotland, he is often informally known as "King Billy".