On September 26, 1459, Pope Pius II called for a new crusade against the Ottomans and on January 14, 1460, at the Congress of Mantua, the Pope proclaimed the official crusade that was to last for three years.
La 26 septembrie 1459, Papa Pius al II-lea a cerut o nouă cruciadă împotriva otomanilor, iar la 14 ianuarie 1460, la congresul din Mantua, a proclamat faptul că cruciada oficială va dura timp de trei ani.