During the Wars of the Three Kingdoms, William Douglas, 11th Earl of Angus, a Catholic, was a supporter of King Charles I. In 1633, he was created Marquess of Douglas.
Following the Battle of Kilsyth in 1645, he joined James Graham, 1st Marquess of Montrose, and was present when Royalist forces fought Covenanter cavalry at the Battle of Philiphaugh where he barely escaped with his life.
Following Cromwell's victory, he was able to make peace and was fined £1,000.

In 1660, William Douglas, the brother of the second Marquess of Douglas became, through marriage, the Duke of Hamilton.
Eventually, the titles of Marquess of Douglas, Earl of Angus, and several others devolved to the Dukes of Hamilton and the heir of that house is always styled 'Marquess of Douglas and Clydesdale'.
The Douglas and Hamilton lines became Douglas-Hamilton and, under Scots law, are barred from inheriting the title of chief of Clan Douglas due to the hyphenated surname.
This similarly applies to the Douglas-Home family who joined their surnames in the nineteenth century.

In 1689, James Douglas, Earl of Angus raised the Cameronian regiment (Earl of Angus's regiment).
Although greatly outnumbered, the regiment managed to defeat a larger Jacobite force at the Battle of Dunkeld.
The regiment was victorious under the command of Captain George Munro, 1st of Auchinbowie.
During the Wars of the Three Kingdoms, William Douglas, 11th Earl of Angus, a Catholic, was a supporter of King Charles I. In 1633, he was created Marquess of Douglas. Following the Battle of Kilsyth in 1645, he joined James Graham, 1st Marquess of Montrose, and was present when Royalist forces fought Covenanter cavalry at the Battle of Philiphaugh where he barely escaped with his life. Following Cromwell's victory, he was able to make peace and was fined £1,000.
In 1660, William Douglas, the brother of the second Marquess of Douglas became, through marriage, the Duke of Hamilton. Eventually, the titles of Marquess of Douglas, Earl of Angus, and several others devolved to the Dukes of Hamilton and the heir of that house is always styled 'Marquess of Douglas and Clydesdale'. The Douglas and Hamilton lines became Douglas-Hamilton and, under Scots law, are barred from inheriting the title of chief of Clan Douglas due to the hyphenated surname. This similarly applies to the Douglas-Home family who joined their surnames in the nineteenth century.
In 1689, James Douglas, Earl of Angus raised the Cameronian regiment (Earl of Angus's regiment). Although greatly outnumbered, the regiment managed to defeat a larger Jacobite force at the Battle of Dunkeld. The regiment was victorious under the command of Captain George Munro, 1st of Auchinbowie.
Clan Douglas