William Sinclair, 2nd Earl of Caithness Scottish Earl (1459–1513) Parents Marjory Sutherland William Sinclair, 1st Earl of Caithness Children Alexander Sinclair of Dunbeath and Stemster John Sinclair, 3rd Earl of Caithness Siblings William Sinclair, 3rd Lord Sinclair Robert Sinclair Alexander Sinclair Arthur Sinclair George Sinclair Eleanor Sinclair Oliver St Clair, 12th Baron of Roslin Catherine Sinclair Mariot Sinclair Susan Sinclair Katherine Sinclair Lady Elizabeth Sinclair Sir David Sinclair Partners Margaret Keith