Indian Ocean trade Madagascar at this time leaving behind a lasting cultural and genetic legacy. Chinese fleets under Zheng He criscrossed the Indian Ocean during the early part of the 15th century. The missions were diplomatic rather than commercial, but many exchanges of gift and produces were made. The Portuguese under Vasco da Gama discovered a naval route to the Indian Ocean through the southern tip of Africa in 1497–98. Initially, the Portuguese were mainly active in Calicut, but the northern region of Gujarat was even more important for trade, and an essential intermediary in east-west trade. Venetian interests were directly threatened as
Portuguese discovery of the sea route to India but they were very expensive because it was an inconvenience to trade. For example, it was dangerous and time consuming to travel by land from Europe to India. As a result, King D. João II of Portugal established a plan for ships to explore the coast of Africa to see if India was navigable via around the cape, and through the Indian Ocean. King João II appointed Bartolomeu Dias, on October 10, 1486, to head an expedition to sail around the southern tip of Africa in the hope of finding a trade route to India. Dias helped in the construction