 Stewart's descendants have held the English throne ever since James I, as well as the royal houses of several European monarchies.As head of the powerful family of Stewart of Darnley he was created Governor of Rothesay Castle in 1465 and appointed Warden of the West Marches of Scotland.When the male line of the Earldom of Lennox became extinct he was heir to half of the lands and made a deal with the co-heir in which he was made Earl of Lennox in 1473.