Ming dynasty
The Yongle Emperor did not like many of the people in government who got there by doing well on their tests. He gave more power to eunuchs, men who were hurt as children to stop them from being able to have children of their own. One of these was Zheng He, a Muslim who led great treasure ships south from Suzhou and Nanjing in 7 big trips between 1405 and 1433. The first trips may have been looking for the Jianwen Emperor, but they also became trips that taught China about the South China Sea and Indian Ocean and opened up more buying and selling between their countries and China.