Which Chinese salior began a series of seven naval expeditions that went as far as the east coast of Africa?

The Chinese sailor who began a series of seven naval expeditions that reached as far as the east coast of Africa was Admiral Zheng He. These voyages took place during the early 15th century under the Ming Dynasty, specifically between 1405 and 1433. Zheng He's expeditions aimed to establish Chinese maritime dominance, expand trade, and foster diplomatic relations with various countries along the Indian ocean. His fleet was notable for its size and sophistication, showcasing China's naval capabilities at the time.