Lord John Stewart (23 October 1621 – 29 March 1644) was a Scottish aristocrat who served as a Royalist commander in theEnglish Civil War. He was one of five sons of Esmé Stewart, 3rd Duke of Lennox and his wife Katherine Clifton, 2nd Baroness Clifton, and the brother of James Stewart, 1st Duke of Richmond.
With his youngest brother, Lord Bernard Stewart, he embarked on a three-year tour of the continent in 1639, before returning to join the King’s cause in the Civil War as a General. He was killed at the Battle of Bramdene near Alresford, Essex, on 29 March 1644.
Only one of his brothers, Lodovic, survived the war to see the restoration of the monarchy in 1660.
It is thought that these brothers, Lord John Stuart and Lord Bernard Stuart, sat for Anthony van Dyck shortly before their three-year tour of the Continent in 1639: http://bit.ly/1TA8ex5