[1] The younger son of Sir George Mackenzie, 2nd Baronet, his father resigned the baronetcy to him in 1704 after being created Earl of Cromartie.
He was then one of the 43 Scottish MPs selected to represent Scotland in the first Parliament of Great Britain in 1707.
He married 3 times and left 6 sons and 2 daughters by his second wife, Anne Campbell.
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