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
Fotheringhay Castle writing in 1540, Langley spent a great deal on Fotheringhay Castle. Langley died in 1402 and was succeeded by his eldest son, Edward. He died without children of his own in 1415, so his property passed to his nephew Richard. Fotheringhay Castle was a favoured residence of Richard, who became Duke of York and a powerful magnate. Married to Cecily Neville of the House of Neville, an influential family in northern England, he fathered two future kings: Edward IV and Richard III, and the latter was born at Fotheringhay Castle in 1452. On 27 March 1454, Richard, Duke of York