In the second half of the 13th century, Mongol gold, silver, and copper coins were minted at Jazirat Ibn ʿUmar, and production there increased after Khan Ghazan's (r. 1295-1304) reforms. It was later attested that the vizier Rashid-al-Din Hamadani had planned to construct a canal from the Tigris by the city. Jazirat Ibn ʿUmar was visited by the Moroccan scholar Ibn Battuta in 1327 and noted the city's mosque, bazaar, and three gates. In 1326/1327, the city was granted as a fief to a Turkman chief, and Jazirat Ibn ʿUmar remained under his control until the disintegration of the Ilkhanate in 1335, soon after which it was seized by the Bohtan clan in 1336/1337 with the aid of al-Ashraf, Ayyubid Emir of Hisn Kayfa. In the 1330s, Hamdallah Mustawfi in "Nuzhat Al Qulub" reported that Jazirat Ibn ʿUmar had an annual revenue of 170,200 dinars. The emirate of Hisn Kayfa had aimed to control Jazirat Ibn ʿUmar through the Bohtan clan in providing military assistance to its capture and the marriage of a daughter to Izz ed-Din, Emir of Bohtan, but this was unsuccessful as the Bohtan emirate developed the city and consolidated their rule, and eventually the emir of Hisn Kayfa attempted to take Jazirat Ibn ʿUmar by force in 1384/1385, but was repelled.