Lord Haddington was the son of
George Baillie-Hamilton, 10th Earl of Haddington, and Georgina Markham. Lord Haddington was elected a
Scottish representative peer from 1874 until his death. He was
High Sheriff of Cheshire in 1871. He was created
Lord Lieutenant of Haddingtonshire in 1874. He was honorary Colonel of the
Lothians and Border Horse and an officer in the
Royal Company of Archers. In 1886, he was elected a Fellow of the
Royal Society of Edinburgh. His proposers were Sir
Thomas Grainger Stewart, Robert Grey,
Sir William Turner, and
Peter Guthrie Tait. He resigned from the Society in 1892. Lord Haddington was appointed a Knight of the
Order of the Thistle (KT) in the
1902 Coronation Honours list published on 26 June 1902, and was invested by King
Edward VII at
Buckingham Palace on 8 August 1902. He lived at
Tyninghame House near
Prestonkirk in
East Lothian. Lord Haddington was a leading Scottish
Freemason. He was the Grand Master of the
Grand Lodge of Scotland from 1892 to 1893 and the Grand Master of the
Royal Order of Scotland from 1891 to 1917. ==Marriage and issue==