Douglas was the son of
James Douglas of Balveny (later 7th Earl of Douglas) and Lady Beatrice Sinclair, daughter to
Henry II Sinclair, Earl of Orkney He was a
twin brother of
James Douglas, 9th Earl of Douglas. In later years, James was believed to be the older by only a few minutes, as he inherited the earldom of Douglas, when their older brother was killed by the king, but it has been suggested that in earlier years Archibald was believed to be the older. He became
Earl of Moray jure uxoris, by marrying Elizabeth Dunbar, 8th Countess of Moray, and appears as such at the
Parliament of Scotland of 1445, as a witness on the letters patent creating
James Hamilton, 1st Lord Hamilton, a
Lord of Parliament He was killed fighting the king's supporters at the
Battle of Arkinholm, and his head taken to the King at
Abercorn Castle. ==References==