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 as a Scheduled Monument and is open to the public. William the Conqueror granted the area to Judith of Lens, wife of Waltheof, Earl of Northumbria. Their eldest daughter, Maud, inherited the lordship of Fotheringhay. Around 1090, she married Simon de Senlis who was made Earl of Huntingdon. Probably in around 1100, he founded Fotheringhay Castle, a Norman motte on the north side of the River Nene. Simon was dead by 1113 when King Henry I of England arranged for Maud to marry Prince David of Scotland. Through this marriage, David who later became King of Scotland, acquired Fotheringhay Castle