The Holy League established in 1594 by Pope Clement VIII was a military alliance of predominantly Christian European countries (Holy League) aimed against the Ottoman Empire during the Long War (1591–1606). The aim of this alliance was to drive the Ottoman Empire out of Europe The coalition was led by Rudolf II, Holy Roman Emperor. The Holy See took for granted that Poland would join the League,together with all most powerful neighbours of the Ottoman Empire, in spite of their mutual enmities. The league expected an assistance of the Balkan's Christian population.