her summer progress in 1563, a crowd forced its way into her private chapel as Mass was being celebrated. During the altercation, the priest's life was threatened. As a result, two of the ringleaders, burgesses of Edinburgh, were scheduled for trial on 24 October 1563. In order to defend these men, Knox sent out letters calling the nobles to convene. Mary obtained one of these letters and asked her advisors if this was not a treasonable act. Stewart and Maitland, wanting to keep good relations with both the Kirk and the Queen, asked Knox to admit he was wrong and to settle the matter quietly. Knox refused and he defended himself in front of Mary and the Privy Council. He argued that he had called a legal, not an illegal, assembly as part of his duties as a minister of the Kirk. After he left, the councillors voted not to charge him with treason. Final years in Edinburgh, 1564–1572 On 26 March 1564, Knox stirred controversy again when he married Margaret Stewart, the daughter of an old friend, Andrew Stewart, 2nd Lord Ochiltree, a member of the Stuart family and a distant relative of the Queen, Mary Stuart. The marriage was unusual because he was a widower of fifty, while the bride was only seventeen. Very few details are known of their domestic life. They had three daughters, Martha, Margaret, and Elizabeth. When the General Assembly convened in June 1564, an argument broke out between Knox and Maitland over the authority of the civil government. Maitland told Knox to refrain from stirring up emotions over Mary's insistence on having mass celebrated and he quoted from Martin Luther and John Calvin about obedience to earthly rulers. Knox retorted that the Bible notes that Israel was punished when it followed an unfaithful king and that the Continental reformers were refuting arguments made by the Anabaptists who rejected all forms of government. The debate revealed his waning influence on political events as the nobility continued to support Mary. On 29 July 1565, when Mary married Henry Stuart, Lord Darnley, some of the Protestant nobles, including James Stewart, 1st Earl of Moray, rose up in rebellion. Knox revealed his own objection while preaching in the presence of the new King Consort on 19 August 1565. He made passing allusions to ungodly rulers which caused Darnley to walk out. Knox was summoned and prohibited from