Elisabeth "Isabel" Sperra /Spar/Strathearn

By his wife Isabel—sometimes surnamed Sperra—daughter of Malise, earl of Strathearn*, he had three sons and a daughter: Sir Henry Sinclair, earl or prince of Orkney [q. v.], William, David, and Margaret, who married first, Thomas, second earl of Angus, and secondly, Sir William Sinclair of Herdmanston. [Wyntoun's Chronicle; Exchequer Rolls of Scotland, vol. i.; Hay's Genealogy of the Sinclairs of Roslin.] T. F. H.** [Ref: DNB, Editor, Sidney Lee, MacMillan Co, London & Smith, Elder & Co., NY, 1909, vol. xviii, p. 308]