The War of the Mantuan Succession (1628–31) was a peripheral part of the Thirty Years' War. Its casus belli was the extinction of the direct male line of the House of Gonzaga in December 1627. Brothers Francesco IV (1612), Ferdinando (1612–26) and Vincenzo II (1626–27), the last three dukes of Gonzaga, had all died leaving no legitimate heirs. The war, fought among the backers of rival claimants, pitted France against the Habsburgs in a contest for control of northern Italy.