Also, these tribute missions brought lots of crazy things to China, including exotic animals. From Africa, Jung Ha brought back a zoo's worth of rhinos, zebras, and even giraffes. Basically, he was like the medieval Chinese Nobel. Thanks, Thought Bubble. So the Chinese were world leaders in naval technology, and they wanted to dominate trade here in the Indian Ocean, so why then did these voyages end? One reason was that Jung Ha couldn't live forever, and sure enough, he didn't. Also, his patron, the Yongle Emperor, died.