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
Warmington, Northamptonshire the building. Residents and visitors may walk from Warmington across the flood plains to Fotheringhay, a historic medieval village, and to the Fotheringhay castle site where Mary, Queen of Scots, was executed in 1587 and Richard III was born in 1452. In the village there are 28 listed buildings, including the Mill and the Dovecote. The farmers fields that encircle the village and give its rural feel, are now mostly owned by the Proby family in nearby Elton village - who are based at Elton Hall. As little ago as the 1960s there were as many as 6 local farmers