He was the son of Matthew Stewart, 2nd Earl of Lennox, and Elizabeth Hamilton, daughter of James Hamilton, 1st Lord Hamilton and Mary Stewart, Princess of Scotland, daughter of King James II of Scotland.
Hijo de Mateo Estuardo, II conde de Lennox, y Elizabeth Hamilton, hija de James Hamilton, I señor Hamilton, y María Estuardo, princesa de Escocia, hija de Jacobo II de Escocia.