The first country to attempt to circumnavigate Africa was Portugal, which had, since the early 15th century, begun to explore northern Africa under Henry the Navigator. Emboldened by these early successes and eyeing a lucrative monopoly on a possible sea route to the Indies, the Portuguese first rounded the Cape of Good Hope in 1488 on an expedition led by Bartolomeu Dias. Just nine years later in 1497, on the orders of Manuel I of Portugal, four vessels under the command of navigator Vasco da Gama continued beyond to the eastern coast of Africa to Malindi and sailed across the Indian Ocean to Calicut, on the Malabar Coast in Kerala in South India — the capital of the local Zamorin rulers. The wealth of the Indies was now open for the Europeans to explore; the Portuguese Empire was the earliest European seaborne empire to grow from the spice trade.