During the reign of Malduin, Mormaer (Earl) of Lennox, 1217–1250, Anselan (third of that name) was granted, in 1225, the island of Clareinch. (Clár Inis). He is referred to as 'clericus meus', meaning 'my clergyman'. He is subsequently recorded as Absalom de Buchanan and it is understood that to have this title, there must have been other grants of land in the parish of Buchanan. During the reign of King Alexander II (1214–1249), Gilbert de Buchanan, seneschal to the Earl of Lennox, received, in 1231, a charter confirming Clareinch and other lands in Buchanan. It is from the lands of Buchanan that the Clan name is derived.