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
John Stewart of Darnley under the Earls of Buchan (Darnley's cousin) and Wigtown, set out to France. By 1420 Darnley was referred to as Constable of the Scottish Army there. Darnley was present at the major Scots victory at the Battle of Baugé in 1421, and for his part in the fight was granted the lordships of Concressault in 1421, and Aubigny-sur-Nère in 1422, by a grateful Dauphin. Darnley was present, and a commander, at the defeat at Cravant, where he was captured and suffered the loss of an eye. During his captivity, Darnley could not participate at the Battle of Verneuil, at which