Desc: Il duca nero: Directed by Pino Mercanti. With Cameron Mitchell, Conrado San Martín, Maria Grazia Spina, Franco Fantasia. Cesare Borgia--a cardinal in the Catholic church, a confidant of the Pope and a member of one of the wealthiest and most powerful families in 16th-century Italy--must deal with a host of political and personal crises. He is having problems with his mistress, and members of a secret society called The Black Carnation are out to assassinate him.