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 Damião de Góis, that during the trip five monuments were set in place. San Rafael, in the Bons Sinais river; São Jorge, in Mozambique; the Holy Spirit in Malindi; Santa Maria, in Ilhéus, and San Gabriel, in Calicut. These monuments were meant to affirm the Portuguese sovereignty in these places so that other explorers who arrived later did not take the land for themselves as discoveries. On May 17, 1498, the fleet reached Kappakadavu, near Calicut, in the current Indian state of Kerala, thus having established the route via the Indian Ocean and managing to open the sea route from