James Graham, 1st Marquess of Montrose was a Scottish nobleman, poet and soldier, who initially joined the Covenanters in the Wars of the Three Kingdoms, but subsequently supported King Charles I as the English Civil War developed. From 1644 to 1646, and again in 1650, he fought a civil war in Scotland on behalf of the King and is generally referred to in Scotland as simply the Great Montrose.
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Source: Wikipedia