He then spent some years on the Continent, and while in Rome entered into relations with the Young Pretender, Charles Edward Stuart. He was in Edinburgh in 1745, and so compromised himself that, after the battle of Culloden, he found it necessary to return to the Continent, where he remained until 1763. It was not until 1771 that he was fully pardoned for any complicity he may have had in the rebellion. He died at his family seat, Coltness, in Lanarkshire.