Final answer:
Emperor Yongle's reign was characterized by expansionist policies and the establishment of a vast maritime empire.
Step-by-step explanation:
Emperor Yongle, also known as Zhu Di, ruled during the Ming dynasty from 1402 to 1424. His reign was characterized by expansionist policies and the establishment of a vast maritime empire. He sponsored exploratory voyages led by Admiral Zheng He, which reached as far as Africa. This period of maritime exploration was a significant milestone in Chinese history.
Learn more about Emperor Yongle's reign during the Ming dynasty