 The treaty also recognised Philip V of Spain's younger son, Don Carlos (the future Charles III of Spain), as heir to the Duchy of Parma and Grand Duchy of Tuscany; Charles had previously endorsed the succession of the incumbent Grand Duke's daughter, Anna Maria Luisa, Electress Palatine.Peace in Europe was shattered by the War of the Polish Succession (1733–1738), a dispute over the throne of Poland between Augustus of Saxony, the previous King's elder son, and Stanisław Leszczyński.Austria supported the former, France the latter; thus, a war broke out.