Major Charles Murray Kennedy St Clair, 17th Lord Sinclair, CVO, DL (21 June 1914 – 1 April 2004) was a Scottish peer who spent his entire life in the service of the Crown; as a soldier, an officer of arms, an equerry in the Queen Mother's Household, a Scottish representative peer and as a Lord Lieutenant.
[2][3] When his father succeeded to the Lordship in 1922,[4] Charles St Clair became known as The Master of Sinclair, in accordance with the usual practice for Scottish peerages.
[6] St Clair was commissioned as a Second Lieutenant on the General List of the Territorial Army in 1936[7] and transferred to the Coldstream Guards in 1937.
As a result of his wounds, St Clair retired from the army on 29 May 1947 whilst a captain and was granted the honorary rank of Major.
Charles St Clair was appointed Portcullis Pursuivant of Arms in Ordinary in 1949,[11] thus becoming a member of the Royal Household.
In 1952 it was St Clair, as Portcullis Pursuivant, who made the ceremonial demand for entry into the City of London for the third traditional reading of the accession proclamation.