The son of the twelfth earl, whom he succeeded in 1823; having served in the army he married Frances Harriet Leigh, daughter of Rev. William Leigh.

REFERENCES TO Alexander Campbell Sinclair, thirteenth earl of Caithness:

Dowager Duchess of Sutherland to Samuel Rogers, 2 August [1835] in Samuel Rogers and his Contemporaries 2 Vols (London: Smith, Elder & Co., 1889)