The Quadruple Alliance was signed on August 2, 1718, in London between Great Britain, the emperor Charles VI, and France, and the United Provinces were supposed to join quickly. The founding principle of the alliance was respect for the settlements of the treaties signed in Utrecht in 1713, which were considered by the allies as the basis of a lasting and balanced peace in Europe. But in 1718, Philip V of Spain was eager to reverse some of the terms of the treaties of Utrecht and maintained his claims in Italy. After a short war against Great Britain, France, and the emperor, he was compelled to accept the principles of the Quadruple Alliance. This multilateral alliance had established a system of collective security that allowed Europe to enjoy one of the longest periods of peace in the early modern period.