Background
Maria Antonietta was the eldest daughter of Prince Francis, Count of Trapani (son of Francis I of the Two Sicilies) and his wife (and niece) Archduchess Maria Isabella of Austria, Princess of Tuscany. Maria Antonietta married her first cousin Prince Alfonso, Count of Caserta, son of Ferdinand II of the Two Sicilies and his wife Maria Theresa of Austria, on 8 June 1868 in Rome.