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
Bolton Castle Knollys (the elder), whom Mary nicknamed 'Schoolmaster', taught her English, as she only spoke French, Latin and Scots. She even met with local "Papists" (Catholics), something for which Knollys and Scrope were severely reprimanded. In January 1569, Mary was removed from Bolton Castle for the last time, being taken to Tutbury in Staffordshire where she would spend much of the 18 years before her execution in 1587. After the death in 1630 of Emanuel Scrope, 1st Earl of Sunderland, without any legitimate children, Bolton Castle was inherited by Mary the eldest of his three illegitimate daughters. She married Charles Powlett,