The Franco-Spanish War (1635–1659) was a military conflict that was the result of French involvement in the Thirty Years' War. After the German allies of Sweden were forced to seek terms with the Holy Roman Empire, the first French minister, Cardinal Richelieu, declared war on Spain because French territory was surrounded by Habsburg territories. The conflict was a continuation of the aims of the War of the Mantuan Succession (1628–31) in which France invaded northern Italy to take possession of territory claimed by the Spanish Habsburgs. The Franco-Spanish War ended in 1659 with the Treaty of the Pyrenees.