In the reign of Juan of Castile, Portugal became one of the chief exploring nations of Europe. Henry, third son of the king, was studious, and learned in astronomy and geography. He obtained royal subsidies, and gathered about him travellers and seamen whom he inspired to set forth on voyages of discovery. Two vessels were sent by the prince to round the southernmost point of Africa, with the object of reaching the East Indies. In 1418 the voyagers discovered Madeira, which was made a Portuguese settlement; but they dreaded the rounding of the south Cape of Africa, a point greatly dreaded by all mariners in those days. The Canary Islands passed at this time into the hands of a French adventurer, De Bethancourt, whose heirs afterwards sold the colony to Henry of Portugal. Vasco de Gama's famous expedition to India was undertaken in 1497, and this bold explorer, unlike his predecessors, doubled the Cape of Good Hope, and travelled as far as Mozambique, where he found pilots who offered to direct his course to India. The pilots, however, proved treacherous. Eventually, after many delays, a trustworthy pilot was found at Melinda, and De Gama reached India, where he opened trading relations with the natives. At the end of two years the discoverer returned to Portugal and was received with great honour. The prosperity of Oporto was largely due to the maritime enterprises of this period. Cabral discovered Brazil in 1500, and De Cortereal is said to have reached Greenland. The sea-rovers were the makers of modern Portugal. The great empire of Brazil was colonised by Juan III. in 1531; and the Portuguese claimed great territories in the East, which yielded splendid revenues. This was the most illustrious epoch in the history of Portugal. Parts of India and China were colonised. Art and learning flourished in the time of Manuel I., and the architectural style known as the Arte Manoelina was developed. This style is a flamboyant Gothic, with Indian and Morisco influence, full of fantasy and often extravagant. The colonisers attempted to convert the people of India to Christianity, and the zealous St Francis Xavier conducted a mission to that country in the reign of Juan III. Trade with Japan was opened at this time. After a long spell of fortune, disaster fell upon Portugal. Philip II. of Spain envied the western strip of the Peninsula, and in 1580 he seized Portugal and annexed it to Spain. It was not until 1640 that the Portuguese regained their territory, and placed the Duke of Braganza on the throne. During the Peninsular War, the city of Oporto was the scene of severe fighting, when the troops of Marshal Soult were surprised and routed by the force of Wellington. In 1832 the Miguelites besieged the city, and were defeated, with much loss, by the Pedroites. Civil disturbances have frequently shaken the town.