After the Fourth Crusade (1202–04), Chersonesus became dependent on the Byzantine Empire of Trebizond as the Principality of Theodoro. After the Siege of Trebizond (1461) the Principality of Theodoro became independent. The city fell under Genoese control in the early 13th century. In 1299, the town was sacked by the Mongol armies of Nogai Khan's Golden Horde. Byzantine sources last mention Chersonesus in 1396, and based on archaeological evidence the site is presumed to have been abandoned in the following decades.