Grand Director. Expeditions The Yuan dynasty and the expanding Sino-Arab trade during the 14th century had gradually expanded Chinese knowledge of the world since "universal" maps previously displaying only China and its surrounding seas began to expand farther and farther southwest, with much more accurate depictions of the extent of Arabia and Africa. Between 1405 and 1433, the Ming government sponsored seven naval expeditions. The Yongle Emperor, disregarding the Hongwu Emperor's expressed wishes, designed them to establish a Chinese presence and impose imperial control over the Indian Ocean trade, impress foreign peoples in the Indian Ocean basin, and extend the empire's tributary system. It has also been inferred from passages in the History of Ming that the initial voyages were launched as part of the emperor's attempt to capture his escaped predecessor, which would have made the first voyage the "largest-scale manhunt on water in the history of China." Zheng He was placed as the admiral in control of the huge fleet and armed forces that undertook the expeditions. Wang Jinghong was appointed as second in command. Preparations were thorough and wide-ranging, including the use of so many linguists that a foreign language institute was established at Nanjing. Zheng He's first voyage departed 11 July 1405, from Suzhou and consisted of a fleet of 317 ships holding almost 28,000 crewmen. Zheng He's fleets visited Brunei, Java, Siam (Thailand), Southeast Asia, India, the Horn of Africa, and Arabia, dispensing and receiving goods along the way. Zheng He presented gifts of gold, silver, porcelain, and silk, and in return, China received such novelties as ostriches, zebras, camels, and ivory from the Swahili Coast. The giraffe that he brought back from Malindi was considered to be a qilin and taken as proof of the Mandate of Heaven upon the administration. The Daxuexi Alley Mosque in Xi'an has a stele dating to January 1523, inscribed with Zheng He's the fourth maritime voyage to Tianfang, Arabian Peninsula. While Zheng He's fleet was unprecedented, the routes were not. His fleet followed long-established, well-mapped routes of trade between China and the Arabian Peninsula that had been used since at least the Han dynasty. That fact, along with the use of a more-than-abundant number of crew members who were regular military personnel, leads some to speculate that the expeditions may have been geared at least partially at spreading China's power through expansion. During the Three Kingdoms Period, the