The beginnings of the idea of the first common South Slavic state were the signing of a declaration on the island of Corfu in 1917. The Corfu Declaration was a formal agreement between the government-in-exile of the Kingdom of Serbia and the Yugoslav Committee (anti-Habsburg South Slav émigrés) that pledged to unify Kingdom of Serbia  and Kingdom of Montenegro with Austria-Hungary’s South Slav autonomous crown lands: Kingdom of Croatia-Slavonia, Kingdom of Dalmatia, Slovenia, Vojvodina (then part of the Kingdom of Hungary) and Bosnia and Herzegovina in a post-war Yugoslav state. It was signed on 20 July 1917 on the island of Corfu.