sentences:  The Marquess of Ailsa is the hereditary Clan Chief of Clan Kennedy.All of the Marquesses are descendant from Anne Watts, mother of Archibald Kennedy, 1st Marquess of Ailsa and descendant of the Schuyler family, the Van Cortlandt family (including Stephanus Van Cortlandt), and the Delancey family of British North America.The title is derived from the island of Ailsa Craig in the Firth of Clyde, which is owned by the family.