Duchy of Mantua
In 1627, Duke Vincent II deceased without heirs, ending the original line of Gonzagas. From 1628 to 1631, a succession war was fought between the Duke of Guastalla, supported by the Holy Roman Empire, and the Duke of Nevers, supported by France, for the control of the Duchy of Mantua. Finally, the Duke of Nevers was recognized as only Duke.