William Mackenzie, 5th Earl of Seaforth, and 2nd titular Marquess of Seaforth, also known as Uilleam Dubh, or Black William, was a Scottish peer and head of Clan Mackenzie. Educated in France and brought up as a Roman Catholic, he was attainted for his part in the 1715 Jacobite Rising and also joined the 1719 Rising.
- Occupation
- politician
- Citizenship
- Kingdom of Great Britain
- Born
- 1681
- Died
- 1740
