Elizabeth I of England Plot of 1586, Elizabeth's spymaster Sir Francis Walsingham and the royal council keenly assembled a case against her. At first, Elizabeth resisted calls for Mary's death. By late 1586, she had been persuaded to sanction her trial and execution on the evidence of letters written during the Babington Plot. Elizabeth's proclamation of the sentence announced that "the said Mary, pretending title to the same Crown, had compassed and imagined within the same realm divers things tending to the hurt, death and destruction of our royal person." On 8 February 1587, Mary was beheaded at Fotheringhay Castle, Northamptonshire. After Mary's execution,
Fotheringhay Castle claim to the castle through David and was to form part of the dowry of Joan, Henry III's sister who was to marry the Scottish king. On 3 December 1219 Marshal finally gave Fotheringhay Castle to the English king. According to the Barnwell chronicler, Hubert de Burgh, 1st Earl of Kent, was given custody of Fotheringhay Castle in 1221 when he married the King of Scotland's sister. The castle had yet been transferred to the control of the King of Scotland and was still effectively an English castle held under Henry III. William II de Forz, 3rd Earl of Albemarle,