Portuguese maritime exploration

• 1. Introduction

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  Portuguese maritime exploration is the story of how a small nation on the western edge of Europe mapped the world's coastlines, opened sea routes to Asia, and set in motion a transformation that would reach every inhabited continent. In the summer of 1497, four ships carrying 170 men left Portugal under the command of Vasco da Gama. Less than a year later, in May 1498, those ships arrived at Calicut on the western coast of India. No European fleet had ever reached India by sea. The journey changed the shape of global trade for generations.

  How did Portugal, a country barely larger than Indiana, build this capacity? The answer reaches back more than a century before da Gama's departure, to a king who insured the cargo ships of merchants in Flanders, a prince who studied the winds along the African coast, and a generation of sailors willing to pass the edge of the known world. What drove them was not simply curiosity. It was gold, spice, and a rivalry with Castile that would eventually divide the entire globe between two crowns.

• 2. Commercial Roots

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  King Dinis of Portugal set something in motion in 1297 that his descendants would ride for centuries. He took a personal interest in Portugal's trade exports, organizing the sale of surplus production to other European countries. On the 10th of May 1293 he had already created a maritime insurance fund for Portuguese traders in Flanders, where merchants paid premiums according to their ship's tonnage and drew on the fund when losses occurred.

  Portugal had things other nations wanted. Wine and dried fruit from Algarve moved to England and Flanders. Salt from Setúbal and Aveiro was a profitable commodity in northern Europe. Leather and kermes, a scarlet dye, also found foreign buyers. In return, Portugal imported armor, manufactured goods, and fine cloth from Flanders and Italy.

  The critical partnership came in 1317, when Dinis struck a deal with a Genoese merchant sailor named Manuel Pessanha. Pessanha was appointed the first Admiral of Portugal. In exchange for trade privileges with Genoa, he delivered twenty warships and trained crews, with the explicit aim of defending Portuguese waters from Muslim pirate raids. This agreement did more than create a navy. It planted a Genoese merchant community in Portugal, bringing with it the financial methods and seafaring knowledge of a republic that had already been navigating the Mediterranean and pushing into the Atlantic.

  The Black Death accelerated everything. In the second half of the fourteenth century, outbreaks of bubonic plague caused severe depopulation. Agricultural land was abandoned. Rural unemployment rose. The sea became the most accessible alternative, and fishing and coastal trading towns drew the displaced population. Between 1325 and 1357, King Afonso IV funded the construction of a proper commercial fleet and ordered the first maritime expeditions, again under Admiral Pessanha and again with Genoese expertise. In 1341 the Canary Islands, already familiar to Genoese seafarers, were officially rediscovered under Portuguese patronage. Within four years Castile disputed ownership, a contest that pushed Portugal harder toward the open Atlantic.

• 3. Henry and the African Coast

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  In 1415, Portugal seized the North African city of Ceuta. The military action served multiple purposes: it secured a position in Morocco, it gave Portuguese nobles a chance to earn wealth and honor in combat, and it introduced a young prince to the logic of maritime power. That prince was Henry, later known as Henry the Navigator.

  Appointed governor of the Order of Christ in 1420 and holding profitable resource monopolies in Algarve, Henry funded a sustained program of coastal exploration along the African Atlantic. He gathered merchants, shipowners, and investors around the shared prospect of new trade. His brother Prince Pedro later granted him a royal monopoly on profits from the discovered territories, tying his personal fortune directly to the advance of exploration.

  In 1418, two of Henry's captains, João Gonçalves Zarco and Tristão Vaz Teixeira, were blown off course by a storm and landed on Porto Santo, an uninhabited island off the African coast. The following year they made landfall on Madeira. They returned with Bartolomeu Perestrelo, and permanent settlement began. Madeira's soil proved fertile. Wheat and later sugarcane were cultivated there, partly by Genoese farmers, and the income enriched both Henry and the settlers.

  The more consequential barrier lay further south. Sailors of the era feared Cape Bojador, beyond which European knowledge of the African coast simply ran out. No one knew whether winds would allow a return. Henry wanted to find out how far Muslim territory extended, whether the trans-Saharan gold caravans could be reached by sea, and whether a Christian kingdom called Prester John, rumored to exist somewhere to the east, was real. In 1434, one of his captains, Gil Eanes, rounded Cape Bojador. Once the psychological barrier broke, the pace quickened. Within two decades Portuguese ships had pushed past the Sahara entirely.

  Henry suffered a sharp personal setback in 1437 when he encouraged King Edward to launch an overland attack on Tangier from Ceuta. The Portuguese army was defeated and escaped only by surrendering Prince Ferdinand, the king's youngest brother, as a hostage. Henry withdrew to Sagres, on Portugal's southern tip, and continued directing exploration from there until his death in 1460. By the time he died, his ships had reached as far as 8 degrees north on the African coast.

• 4. Tools of the Advance

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  Around 1440, Portuguese navigators adopted a vessel that suited their work particularly well. The caravel was not new, but it was newly useful. Its shallow draft let sailors approach unknown coasts without grounding. Its hull shape included a rudder attached to the sternpost, unlike older vessels that used side-mounted steering oars, and a lateen rig that gave it better windward sailing than most contemporary ships. A captain could make progress against the wind, which mattered enormously when probing unknown coastlines and needing to return.

  Navigators developed a methodical practice. Moving south along the African coast, they advanced at an average rate of one degree of latitude per year. Senegal and the Cape Verde Peninsula were reached in 1445. That same year, the first overseas feitoria, or trading post, was established on the island of Arguin off Mauritania, created specifically to pull Muslim traders into Portuguese commercial networks. The feitoria model would repeat along every coast the Portuguese reached, building a chain of commercial footholds rather than a chain of forts.

  Cartography advanced in parallel with the voyages. The 32-point compass card replaced the 12-point version in 1434. Stone crosses called padrões, inscribed with the Portuguese coat of arms, were planted at coastal landmarks as the ships moved south, marking territorial claims in durable stone. Sailors who pushed into the Southern Hemisphere needed a new constellation to navigate by; they turned to the Southern Cross when João de Santarém and Pedro Escobar crossed the equator in 1471.

  In 1443, Prince Pedro formalized Henry's authority by granting him the monopoly of navigation, war, and trade in all lands south of Cape Bojador. Papal backing followed: the bull Dum Diversas in 1452 and Romanus Pontifex in 1455 granted Portugal a trade monopoly over its newly discovered territories, embedding the exploration program in a legal and religious framework that other European powers would eventually have to negotiate with or circumvent.

• 5. Gold Coast and the Cape

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  After Henry's death, the African enterprise passed into private hands for a decade. In 1469, King Afonso V granted merchant Fernão Gomes the monopoly on trade in part of the Gulf of Guinea for an annual fee of 200,000 reals. Gomes had to explore 100 leagues of new coastline each year for five years. He exceeded the requirement. His hired explorers, including João de Santarém, Pedro Escobar, Lopo Gonçalves, and Fernão do Pó, crossed the equator into the Southern Hemisphere and found the islands of São Tomé and Príncipe.

  In 1471 those explorers reached Elmina on the Gold Coast, in present-day Ghana, and discovered a thriving overland trade in gold between local people and Arab and Berber merchants. Gomes set up a trading post that became known simply as "A Mina," or The Mine. The name spoke for itself. In 1481 the newly crowned João II replaced private enterprise with crown control, ordering the construction of São Jorge da Mina fort, now known as Elmina Castle, to protect the gold trade as a royal monopoly.

  In 1482, Diogo Cão reached the mouth of the Congo River and planted a padrão there; he explored 150 kilometers upriver to the Yellala Falls. By 1486 he had pushed further south to Cape Cross, near the Tropic of Capricorn in present-day Namibia.

  Then came Bartolomeu Dias. In 1488 he rounded the Cape of Good Hope near the southern tip of Africa, becoming the first European to enter the Indian Ocean from the Atlantic. The feat disproved a geographical assumption that had persisted since the ancient scholar Ptolemy: that the Indian Ocean was a closed sea, separate from the Atlantic. At roughly the same time, Pêro da Covilhã reached India by traveling overland through Egypt and Yemen, and visited Madagascar. He recommended that future expeditions use the southern sea route. Nine years would pass before Portugal acted on that recommendation, a delay historians attribute partly to the complex diplomatic negotiations that produced the Treaty of Tordesillas.

• 6. Dividing the World

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  Christopher Columbus's 1492 landfall for Spain forced a diplomatic reckoning. Spain and Portugal both held legal frameworks supporting their exploration claims. Both needed a settlement that would prevent their ships from colliding over the same territory. The Treaty of Tordesillas, signed in 1494, solved the problem with a line on a map: a north-south meridian 370 leagues, or roughly 970 miles, west of the Cape Verde islands. Portugal claimed everything east of the line; Spain claimed everything west.

  The treaty had a built-in flaw. It was not possible at the time to accurately measure longitude at sea, so the precise location of the dividing line remained disputed between the two countries until 1777. In the eastern hemisphere, a follow-on agreement called the Treaty of Zaragoza in 1529 set a separate boundary, placing the Moluccas on Portugal's side and the Philippines on Spain's, 297.5 leagues east of the Moluccas.

  The treaty's effects proved lopsided in practice. Brazil turned out to lie east of the Tordesillas line, giving Portugal a massive South American territory. When Pedro Álvares Cabral landed on the Brazilian coast in 1500, while on his way to India, the territory was probably an accidental discovery. Cabral recommended settlement. Two follow-up voyages were dispatched in 1501 and 1503. The land was rich in pau-brasil, the reddish hardwood from which the country later took its name, but the absence of gold or silver meant Portuguese energy remained concentrated on the Indian Ocean route for years. In 1530, King John III organized systematic colonization around 15 hereditary captainships to overcome the problem of French incursions on the coast.

• 7. The Indian Ocean Network

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  Vasco da Gama's squadron left Portugal on the 8th of July 1497. Four ships, 170 men. They rounded the Cape of Good Hope and moved up the East African coast, where a local pilot boarded and guided them across the Indian Ocean. They arrived at Calicut in May 1498. Da Gama negotiated an ambiguous letter from the Zamorin of Calicut and left men there to begin a trading post before sailing home.

  Portugal moved quickly to institutionalize what da Gama had opened. The Casa da Índia was established in Lisbon to administer the royal monopoly over Indian Ocean navigation and trade. Private sponsors dropped away; the Crown absorbed the enterprise entirely. Feitoria posts spread along the East African coast and into the Indian Ocean within years of the first arrival.

  The second fleet to India, under Pedro Álvares Cabral in 1500, arrived at Calicut in September and signed the first formal trade agreement in India. The factory there was attacked by Muslim traders on the 16th of December; several Portuguese died, including the scribe Pero Vaz de Caminha. Cabral bombarded Calicut in retaliation and moved south to Kochi, where the Maharaja was locked in rivalry with the Zamorin of Calicut. Portuguese ships became useful allies. They received permission to build Fort Manuel and a trading post, the first permanent European settlement in India. In 1503 they built the St. Francis Church there.

  In 1505 King Manuel I appointed Francisco de Almeida as the first Viceroy of Portuguese India, headquartered at Kochi. That year Portugal took Kannur and founded St. Angelo Fort. Lourenço de Almeida, the Viceroy's son, arrived in Ceylon and found the island divided into seven rival kingdoms. He established a defense pact with the kingdom of Kotte. The fortress of Colombo was founded in 1517.

  The decisive sea battle came in 1509 at Diu, where a Portuguese fleet defeated a combined force that included the Ottoman Sultan Beyazid II, the Sultan of Gujarat, the Mamluk Sultan of Cairo, and the Venetian and Ragusan Republics. The Ottomans and Egyptians withdrew their navies from the Indian Ocean. A second siege at Diu in 1538 ended Ottoman ambitions permanently and confirmed Portuguese dominance of the ocean for nearly a century. In 1510, Afonso de Albuquerque took Goa from the Bijapur sultanate with the help of a Hindu privateer named Timoji. Goa became the seat of the Estado da India, the governing body of Portuguese interests in the east.

• 8. East Asia and the Limits of Empire

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  In April 1511 Albuquerque sailed to Malacca in present-day Malaysia, which the merchant Tomé Pires described as the most important point in the eastern trade network, where Malay, Gujarati, Chinese, Japanese, Javanese, Bengali, Persian, and Arabic traders all met. After conquest, Malacca became the base for further expansion toward China and Southeast Asia. Albuquerque promptly sent Duarte Fernandes on a diplomatic mission to the kingdom of Siam, where Fernandes became the first European to arrive. In November of that year Albuquerque learned the location of the Moluccas and dispatched António de Abreu to find them; the expedition arrived in early 1512. Abreu's deputy Francisco Serrão advanced to Ternate, where a Portuguese fort was permitted.

  Jorge Álvares reached southern China from Malacca in 1513, following trade contacts that led to Guangzhou. In 1542 Francisco Zeimoto, António Mota, and other traders arrived in Japan at Tanegashima. According to Fernão Mendes Pinto, who claimed to be present, the locals were immediately impressed by European firearms and began manufacturing them on a large scale. In 1557 the Chinese authorities permitted Portugal to settle in Macau in exchange for an annual payment, creating a hub for the triangular trade between China, Japan, and Europe. In 1570 Portugal purchased a Japanese port and founded the city of Nagasaki, which became Japan's gateway to the wider world for many years.

  Spain kept pressing from the west. After Fernão de Magalhães completed his circumnavigation in 1522 under the Spanish flag, Charles V sent a new expedition in 1525 under García Jofre de Loaísa to colonize the Moluccas, claiming the islands fell on his side of the Tordesillas line. Nearly a decade of skirmishes followed before the Treaty of Zaragoza settled the dispute in 1529. Jesuit missionaries moved through the same sea lanes the traders had opened. Francis Xavier arrived in Goa in 1542 in the service of King John III, beginning a mission that carried Christianity across Asia with mixed results. Gonçalo da Silveira traveled up the Zambezi River in 1560, reaching the capital of Monomotapa on the 26th of December. Bento de Góis became the first known European to travel overland from India to China between 1602 and 1606, crossing Afghanistan and the Pamirs.