descendants. In 2015 the International Society of Genetic Genealogy recognized single nucleotide polymorphism (SNP) S781 as evidence of direct patrilineal descent from Sir John Stewart. See also Bonkyl Kirk References SourcesCalendar of documents relating to Scotland preserved in Her Majesty's Public Record Office''. V vols., ed Bain. London 1881. http://www.thepeerage.com/p514.htm 13th-century births Year of birth uncertain 1298 deaths 13th-century Scottish people Scottish deaths at the Battle of Falkirk Scottish knights John John