Henry Stuart, Lord Darnley not together in early 1545 and a letter of March 1566, from Mary Queen of Scots, indicates Darnley was then nineteen years old. Therefore the date 1546 would seem probable. A descendant of both James II of Scotland and Henry VII of England, Henry Stuart, Lord Darnley, was heir to two royal houses, the House of Stuart and the House of Tudor, thus he had claim to both the Scottish and English thrones, a claim that may have cost him his life. In 1545, his father, Matthew Stewart, 4th Earl of Lennox was found guilty of treason in Scotland for
Henry Stuart, Lord Darnley a galliard with Mary at night. From then on, he was constantly in Mary's company. Darnley was his wife's half-first cousin through two different marriages of their grandmother, Margaret Tudor, putting both Mary and Darnley high in the line of succession for the English throne. Darnley was also a descendant of a daughter of James II of Scotland, and so also in line for the throne of Scotland. As a preliminary to the marriage, Darnley was made Lord of Ardmanoch and Earl of Ross at Stirling Castle on 15 May 1565. An entourage of 15 men were made knights, including