Following the fall of Constantinople (1453), and thanks to the intercession of Michael Critobulus, Sultan Mehmed II recognized Dorino I Gattilusio's possession of Lemnos and Thasos in exchange for an annual tribute of 2,325 gold coins. When Dorino died in 1455, his son and successor Domenico was only granted Lemnos, however. In 1456, Mehmed II attacked and captured the Gattilusi domains in Thrace (Ainos and the islands of Samothrace and Imbros). During the subsequent negotiations with Domenico Gattilusio, the Greek populace of Lemnos rose up against Domenico's younger brother Niccolò Gattilusio and submitted to the Sultan, who appointed a certain Hamza Bey as governor under the Bey of Gallipoli, Isma'il. Mehmed granted a special legal charter ("kanun-name") to Lemnos, Imbros, and Thasos, at this time, later revised by Selim I in 1519. In 1457 a Papal fleet under Cardinal Ludovico Scarampi Mezzarota captured the island. Pope Callixtus III (in office 1455-1458) hoped to establish a new military order on the island, which controlled the exit of the Dardanelles, but nothing came of it as Isma'il Bey soon recovered Lemnos for the Sultan.