William FitzWilliam (Lord Deputy) William FitzWilliam (Lord Deputy) Sir William FitzWilliam (1526–1599) was an English Lord Justice of Ireland and afterwards Lord Deputy of Ireland. In 1587, as Governor of Fotheringhay Castle, he supervised the execution of the death sentence on Mary, Queen of Scots. He was the Member of Parliament for Peterborough and represented County Carlow in the Irish House of Commons. He lived at Gainspark, Essex, and Milton Hall. FitzWilliam was born at Milton Hall, Northamptonshire, the eldest son of Sir William (d. 1576) and grandson of William Fitzwilliam, Sheriff of London, who had been treasurer and chamberlain to Cardinal Wolsey and
Mary, Queen of Scots arrested by Henry, and their goods impounded. The arrests caused anger in Scotland, and Arran joined Beaton and became a Catholic. The Treaty of Greenwich was rejected by the Parliament of Scotland in December. The rejection of the marriage treaty and the renewal of the Auld Alliance between France and Scotland prompted Henry's "Rough Wooing", a military campaign designed to impose the marriage of Mary to his son. English forces mounted a series of raids on Scottish and French territory. In May 1544, the English Earl of Hertford (later Duke of Somerset) raided Edinburgh, and the Scots took Mary to