Guillemus Caoursin. Descriptio obsidone Rhodiae. Venice, Erhard Ratdolt, 1480.
This incunabulum (a book printed before 1500) describes the Ottoman Turks' unsuccessful siege of the Knight's city of Rhodes in 1480.
The author, Guillemus Caoursin, was the vicechancellor of the Order and an eyewitness to the siege.