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
English invasion of Scotland (1482) differing story. All accounts emphasise the coinage of the "black metal" currency and its devaluation as major factor in the King's unpopularity at Lauder, along with his favouritism of non-noble upstarts. Robert Lindsay of Pitscottie, probably writing in the 1570s, misunderstands the Treaty of Fotheringhay and presents Albany as his brother's rescuer after the coup at Lauder Bridge, seeking English support at the King's request. After Gloucester comes to Edinburgh and James III is released, the royal brothers ride together from the Castle to Holyroodhouse. Then Pitscottie has the brothers and the Duke of Gloucester travel to Stirling and tour