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
First Dutch Expedition to Nusantara their spice in Lisbon, Portugal, as they could still make a decent profit by reselling it throughout Europe. However, in the 1590s Spain, which was at war with the Netherlands, was in a dynastic union with Portugal, thus making continued trade practically impossible. This was intolerable, and the Dutch would have been glad to circumvent the Portuguese monopoly and go straight to Indonesia, but the sailing directions needed in order to reach Indonesia were jealously guarded by the Portuguese. However, in 1592 the cartographer Petrus Plancius published a series of charts showing, in exact detail, the route to the Indies.