The article analyses the use of Byzantine oracles, such as the Oracles of Leo the Wise and Expositio litterarum quae in speulcro Constantini Magni inscriptae erant, in a 17th century pseudo-prophetic text about the fall of the Ottoman Empire, Presagio dell’imminente rovina e caduta dell’ Impero Ottomano, printed in Padova in 1684. It highlights the role of the siege of Vienna in 1683 and of the Sultan Mehmed IV (1648–1687) in the anti-Ottoman propaganda literature flourishing in Venice in that period.