 Moncreiffe wrote that it was more likely Anrothan married a daughter of the local king of Argyll or a sub-king of Cowal and through this marriage, Anrothan's descendants gained control of the lands of Knapdale and Cowal, and several Scottish clans claim a descent from him including Clan MacNeil of Barra, Clan Lamont, Clan MacEwen of Otter, and the MacSweens who became the Irish Sweeney Clan who left Scotland and returned to Ireland in the 14th century as leaders of Gallowglass.In about 1230 Gilchrist Maclachlan was witness to a charter of Kilfinan granted by Laumanus, ancestor of Clan Lamont.The first documentary evidence of the clan's ownership of lands was recorded in 1292, when Gilleskel Maclauchlan received a charter of his lands in Ergadia from John, King of Scots.