Alexander Leslie, 1st Earl of Leven, Scottish field marshal (b. 1580)
Alexander Leslie, 1st Earl of Leven (1580 – 4 April 1661) was a Scottish soldier in Swedish and Scottish service. Born illegitimate and raised as a foster child, he subsequently advanced to the rank of a Swedish Field Marshal, and in Scotland became Lord General in command of the Army of the Covenanters, a privy councillor, captain of Edinburgh Castle, Lord Balgonie and Earl of Leven. In England he commanded the Army of the Solemn League and Covenant and was senior commander of the Army of Both Kingdoms (1642–1647). Leslie served in the Thirty Years' War, the Bishops' Wars, and most of the English Civil War, fighting primarily in the First English Civil War. Leslie would live a long life, dying roughly at the age of 80 or 81.