information:filtering, linguistic:translation, stylistic:style_transfer
Portuguese monopoly over trade in the Indian Ocean and Asia

In 1509, the Portuguese under Francisco de Almeida won the decisive battle of Diu against a joint Mamluk and Arab fleet sent to expel the Portuguese of the Arabian Sea. The victory enabled Portugal to implement its strategy of controlling the Indian Ocean.

Early in the 16th century, Afonso de Albuquerque emerged as the Portuguese colonial viceroy most instrumental in consolidating Portugal's holdings in Africa and in Asia. He understood that Portugal could wrest commercial supremacy from the Arabs only by force, and therefore devised a plan to establish forts at strategic sites which would dominate the trade routes and also protect Portuguese interests on land. In 1510, he conquered Goa in India, which enabled him to gradually consolidate control of most of the commercial traffic between Europe and Asia, largely through trade; Europeans started to carry on trade from forts, acting as foreign merchants rather than as settlers. In contrast, early European expansion in the " West Indies ", (later known to Europeans as a separate continent from Asia that they would call the " Americas ") following the 1492 voyage of Christopher Columbus, involved heavy settlement in colonies that were treated as political extensions of the mother countries.

Lured by the potential of high profits from another expedition, the Portuguese established a permanent base in Cochin, south of the Indian trade port of Calicut in the early 16th century. In 1510, the Portuguese, led by Afonso de Albuquerque, seized Goa on the coast of India, which Portugal held until 1961, along with Diu and Daman (the remaining territory and enclaves in India from a former network of coastal towns and smaller fortified trading ports added and abandoned or lost centuries before). The Portuguese soon acquired a monopoly over trade in the Indian Ocean.

Portuguese viceroy Albuquerque (1509–1515) resolved to consolidate Portuguese holdings in Africa and Asia, and secure control of trade with the East Indies and China. His first objective was Malacca, which controlled the narrow strait through which most Far Eastern trade moved. Captured in 1511, Malacca became the springboard for further eastward penetration, starting with the voyage of António de Abreu and Francisco Serrão in 1512, ordered by Albuquerque, to the Moluccas. Years later the first trading posts were established in the Moluccas, or "Spice Islands", which was the source for some of the world's most hotly demanded spices, and from there, in Makassar and some others, but smaller, in the Lesser Sunda Islands. By 1513–1516, the first Portuguese ships had reached Canton on the southern coasts of China.

In 1513, after the failed attempt to conquer Aden, Albuquerque entered with an armada, for the first time for Europeans by the ocean via, on the Red Sea; and in 1515, Albuquerque consolidated the Portuguese hegemony in the Persian Gulf gates, already begun by him in 1507, with the domain of Muscat and Ormuz. Shortly after, other fortified bases and forts were annexed and built along the Gulf, and in 1521, through a military campaign, the Portuguese annexed Bahrain.

The Portuguese conquest of Malacca triggered the Malayan–Portuguese war. In 1521, Ming dynasty China defeated the Portuguese at the Battle of Tunmen and then defeated the Portuguese again at the Battle of Xicaowan. The Portuguese tried to establish trade with China by illegally smuggling with the pirates on the offshore islands off the coast of Zhejiang and Fujian, but they were driven away by the Ming navy in the 1530s-1540s.

In 1557, China decided to lease Macau to the Portuguese as a place where they could dry goods they transported on their ships, which they held until 1999. The Portuguese, based at Goa and Malacca, had now established a lucrative maritime empire in the Indian Ocean meant to monopolize the spice trade. The Portuguese also began a channel of trade with the Japanese, becoming the first recorded Westerners to have visited Japan. This contact introduced Christianity and firearms into Japan.

In 1505, (also possibly before, in 1501), the Portuguese, through Lourenço de Almeida, the son of Francisco de Almeida, reached Ceylon. The Portuguese founded a fort at the city of Colombo in 1517 and gradually extended their control over the coastal areas and inland. In a series of military conflicts and political maneuvers, the Portuguese extended their control over the Sinhalese kingdoms, including Jaffna (1591), Raigama (1593), Sitawaka (1593), and Kotte (1594)- However, the aim of unifying the entire island under Portuguese control faced the Kingdom of Kandy `s fierce resistance. The Portuguese, led by Pedro Lopes de Sousa, launched a full-scale military invasion of the kingdom of Kandy in the Campaign of Danture of 1594. The invasion was a disaster for the Portuguese, with their entire army wiped out by Kandyan guerrilla warfare. Constantino de Sá, romantically celebrated in the 17th century Sinhalese Epic (also for its greater humanism and tolerance compared to other governors) led the last military operation that also ended in disaster. He died in the Battle of Randeniwela, refusing to abandon his troops in the face of total annihilation.

The energies of Castile (later, the unified Spain), the other major colonial power of the 16th century, were largely concentrated on the Americas, not South and East Asia, but the Spanish did establish a footing in the Far East in the Philippines. After fighting with the Portuguese by the Spice Islands since 1522 and the agreement between the two powers in 1529 (in the treaty of Zaragoza), the Spanish, led by Miguel López de Legazpi, settled and conquered gradually the Philippines since 1564. After the discovery of the return voyage to the Americas by Andres de Urdaneta in 1565, cargoes of Chinese goods were transported from the Philippines to Mexico and from there to Spain. By this long route, Spain reaped some of the profits of Far Eastern commerce. Spanish officials converted the islands to Christianity and established some settlements, permanently establishing the Philippines as the area of East Asia most oriented toward the West in terms of culture and commerce. The Moro Muslims fought against the Spanish for over three centuries in the Spanish–Moro conflict.