 A Notarial Instrument of Adam Hepburn Lord of Hailes dated 23 March 1417, refers to a Letters Patent of the late Margaret, Countess of Mar, signed and dated at Tantallon Castle on 10 December 1389, and read out in the church of the Friars Minors of Haddington in the presence of Sir Robert Maitland of Thirlestane, Sir Robert de Lowedir, Lord of the Bass, Sir Alexander de Cockburn Lord of Langtoun, all knights, and others.