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 to serve the possible epic maritime adventure that lay ahead. The travel plan predicted the safety of the route. For this, it was necessary to install trading posts along the way, and build fortresses. The mission was up to the captain of the armada who was provided with many gifts and equipment to brave the seas and diplomatic credentials and perseverance to create links with unknown monarchs who eventually were found along the way. But it was not in the reign of King John II of Portugal that this project, which was already facing a strong opposition from the court,