Mary Kerr (25 Mar 1567 - 15 Dec 1611) (1878–1957) Parents Janet Douglas Sir William Ker of Cessford Children Margaret Scott Elizabeth Scott Walter Scott, 1st Earl of Buccleuch Siblings Euphemia Ker Margaret Ker Sir Mark Ker of Ormistoun Robert Ker, 1st Earl of Roxburghe Elizabeth Ker Partners Walter Scott, 1st Lord Scott of Buccleuch