William St Clair of Roslin
William St Clair of Roslin, 21st Baron of Roslin was a member of the Clan Sinclair. His title, Baron of Roslin, was not a peerage but a Scottish feudal barony. He had an interest in sport and was a skilled golfer and archer.Freemasonry
He was a Scottish Freemason, being Initiated in Lodge Canongate Kilwinning on 18 May, Passed on 2 June 1736 and Raised on 3 November 1736. He is known as the first Grand Master of the Grand Lodge of Scotland. He became the first Grand Master Mason by acclamation on St. Andrew's Day of the same year.