front of the castle walls on 1 March. Today, brick lettering with his initials marks the spot where he died. In May the same year, Wishart's friends conspired against the cardinal. On 26 May they gained entry to the castle by disguising themselves as masons when some building work was in progress. After overcoming the garrison, they murdered Cardinal Beaton and hung his body from his window on the front of the castle. Following this murder, the Protestants took refuge in the castle and formed the first Protestant congregation in Scotland. A long siege was ordered by the Scottish Regent, James Hamilton, 2nd Earl of Arran. In October 1546 a mine was begun by the attackers which was successfully counter-mined by the defenders. Both the mine and counter-mine cut through solid rock. They were rediscovered in 1879 and remain open to the public today. Arran heard that an English army was on its way to relieve the Castle and asked Fife Lairds like John Wemyss of that Ilk to come by 4 November 1546, bringing his followers and whatever artillery they had to resist a sea invasion. Although Henry VIII made plans to assist the Protestants within the castle, the invasion never came and his son Edward VI did not send aid. During an armistice in April 1547, John Knox entered the castle and served as the garrison's preacher for the remainder of the siege. For a time Knox had the freedom to pass to and from the castle to preach in the parish church. This peaceful interlude came to end, however, when a French fleet arrived bringing an Italian engineer Leone Strozzi who directed a devastating artillery bombardment to dislodge the Protestant lairds. The lairds knew an expert was in the field when their own Italian engineer observed cannon being winched into position with ropes rather than exposing the besiegers to their fire. Guns were also placed on St Salvator's and the cathedral towers. One of the largest Scottish cannon was called "thrawynmouthe." The castle was quickly rendered indefensible, within six hours according to Robert Lindsay of Pitscottie. The defeated Protestants were taken away with some imprisoned in France while others, including Knox, were condemned to the galleys. Decline and current condition Following this Protestant defeat, the castle was substantially rebuilt by Archbishop John Hamilton, the illegitimate brother of Regent Arran, and successor to Dr. David Cardinal Beaton. But