William Stewart, 1st Viscount Mountjoy, was a soldier in the English army. He became Commissioner for Managing Claims, and in 1684 was made Master-General of the Ordnance for life. He was appointed Governor of Derry, but was soon replaced by Lundy. He went to Paris, where he was arrested and dismissed from the Master-Generalship. He was held in custody until 1692, and on his release joined William's army and was killed at the Battle of Steenkirk.

Born:	1650
Died:	3 August 1692