War
Fall of ConstantinopleOttoman Empire and Serbian Despotate (cavalry its ruler was forced to send as an Ottoman vassal)
Ancient Rome, Genoese soldiers under Giovanni Giustiniani, Venetians in the city, Ships and men sent by the Pope and by Alfonso of Aragon, and Ottoman prince Orhan Çelebi and his Turkish followers, who fought on the Byzantine side
The Ottoman Empire took Constantinople on 29 May 1453 and made it its capital; the Byzantine Empire ended with the death of Constantine XI.