(April 1915) Secret treaty between neutral Italy and the Allied forces of France, Britain, and Russia to bring Italy into World War I. The Allies wanted Italy's participation because of its border with Austria.
Italy was promised Trieste, southern Tyrol, northern Dalmatia, and other territories in return for a pledge to enter the war within a month. Despite the opposition of most Italians, who favoured neutrality, Italy joined the war against Austria-Hungary in May.