William Douglas, 9th Earl of Morton 169
- Marriage: Grizel Middleton in 1662
- Died: 1681
William took steps to shore up the grant of the Islands of Orkney and Zetland given to his grandfather, Sir William, 7th Earl of Morton, but the Islands were
annexed to the Crown, by Act of Parliament, on December 27, 1669. On
September 9, 1672 he resigned the Barony of Dalkeith in favor of
James, the Duke of Buccleuch. William died in 1681 leaving no heir, passing the Earldom to his uncle.
William married Grizel Middleton, daughter of John Middleton, Earl of Middleton and Unknown, in 1662.