The modern city of Ch'üan-Chou, in the Province of Fukien, China, and Situated Near to Amoy on the Formosa Strait, was from the tenth to the fifteenth centuries the chief port for the ocean-going trade between China and the West, particularly during the Sung (A.D. 960–1280) and the Yüan (A.D. 1280–1368) dynasties. An extensive and lucrative trade was carried on with Java, Sumatra, India, and the Persian Gulf. Through Arabic, Persian, and Syriac speaking intermediaries precious products of China found their way on to the European markets. In the thirteenth century the city of Zaitún, as it was known in the West, excited the admiration and wonder of the Polos, the early Franciscan missionaries, and Muslim travellers by the size and wealth of its commercial undertakings. With the fall of the Mongol (Yüan) dynasty about the middle of the fourteenth century the city fell on evil times from which it never fully recovered, for though some considerable trade was carried on during the Ming and Ch'ing dynasties, Ch'üan-chou as an international port declined, and its great rival, Canton, grew from the time that Portuguese traders were allowed to establish themselves at Macao.