Eleanor Sinclair Countess of Atholl. (ca. 1457 - ca. 1518) (d. 1519) Parents Marjory Sutherland William Sinclair, 1st Earl of Caithness Children Elizabeth Stewart Lady Elizabeth Stewart Lady Elspeth Stewart Lady Jean Stewart Lady Isabel Stewart Lady Margaret Stewart Lady Janet Stewart John Stewart, 2nd Earl of Atholl Lady Elizabeth Stewart Lady Marjory Stewart Siblings Robert Sinclair Alexander Sinclair Arthur Sinclair George Sinclair Oliver St Clair, 12th Baron of Roslin William Sinclair, 2nd Earl of Caithness Catherine Sinclair Mariot Sinclair Susan Sinclair Katherine Sinclair Lady Elizabeth Sinclair William Sinclair, 3rd Lord Sinclair Sir David Sinclair Partners John Stewart, 1st Earl of Atholl