Margaret married Sir Simon FRASER of Brotherton, Sheriff of Kincardine, Ancestor of Frasers of Lovat, son of Sir Andrew FRASER of Touch-Fraser, Sheriff of Stirling and Beatrix LE CHEYNE. (Sir Simon FRASER of Brotherton, Sheriff of Kincardine, Ancestor of Frasers of Lovat was born about 1292 and died in 1333 in Battle of Halidon Hill, Berwick On Tweed, England 1.)
(Simon Fraser of Brotherton married) "Margaret dtr of John, Earl of Orkney and Caithness, whose wife may have been the dtr and was the eventual heiress of Sir David Grahame..." 2
1 Internet Site, https://www.electricscotland.com/webclans/minibios/f/frasers_tweedies.htm.
Internet Site, https://www.baronage.co.uk/bphtm-03/fraser03.html.