 Guillaume Dubois, formerly tutor to the Duke of Orléans, and now his chief minister, caused war to be declared against Spain, with the support of Austria, England and the Netherlands (Quadruple Alliance).After some successes of the French marshal, the Duke of Berwick, in Spain, and of the imperial troops in Sicily, Philip V made peace with the regent (1720).From the beginning of 1721, Philip V of Spain, and the Duke of Orléans had been negotiating the project of three Franco-Spanish marriages in order to cement tense relations between Spain and France.