War of the Mantuan Succession
…December 1627 of Vincenzo II, last Gonzaga ruler of Mantua and Montferrat. This led to a proxy war between the French-backed Duke of Nevers, and the Duke of Guastalla, supported by Spain. It is considered a related conflict of the 1618 to 1648 Thirty Years' War. Fighting centred on the French-held fortress of Casale…