He was appointed a Justice of the Peace for Ayrshire and Renfrewshire on 9 October 1663, a Commissioner for the Collection of the Excise on 23 January 1667 and a Commissioner of Militia for Ayrshire and Renfrewshire on 3 September 1668.[1]
In 1674, together with the Marquess of Douglas and the Earl of Erroll, Ross raised three troops of horse, which were subsequently disbanded in 1676.[2] On 1 November 1677, he was lieutenant-colonel of the Scots Guards. He was in command at Glasgow during the Battle of Drumclog on 1 June 1679, when Claverhouse was defeated by the Covenanters. He provided support to him in the aftermath of that battle.[1] Shortly afterwards, he succeeded in beating off a determined attack by the Covenanters on Glasgow itself.[3]
Grizel (who married Sir Alexander Gilmour of Craigmillar and died on 10 June 1732).
Lord Ross's first wife died in 1665 and he soon after married, secondly, Jean Ramsay, eldest daughter of George Ramsay, 2nd Earl of Dalhousie. She survived him and married Robert Makgill, 2nd Viscount of Oxfuird, before dying in November 1696. By her, Lord Ross had:
Charles RossofBalnagown, who inherited that estate on the death of David Ross of Balnagown (although no relation of his)
