He was a Groom of the Bedchamber to King James II in 1686.
[1] During the Williamite War in Ireland, he was a major, and then a lieutenant colonel, in Fitz-James's Regiment of Infantry.
[2] In 1689 was sent to Château de Saint-Germain-en-Laye in France by James and was soon dispatched on fruitless diplomatic missions to seek support from the French King Louis XIV and the Pope.
He remained at the Jacobite court in France after James had left Ireland in 1690, and he was attainted by the Williamites in 1691.
He was later made Vice-Chamberlain of the Household in France on the accession in 1701 of James Francis Edward Stuart as the de jure King of England, Scotland and Ireland.