Duke of Brissac
The younger son of Charles de Cossé, Count of Brissac, was Charles II de Cossé. He fought for the Catholic League and, as military governor of Paris, opened the gates of that city to Henry IV of France, who appointed him Marshal of France in 1594. The County of Brissac was raised in status to a Duchy in the Peerage of France in 1611. At that point, Charles II de Cossé became the first Duke of Brissac.