Key takeaways
- Wikipedia dates the Age of Discovery, also called the Age of Exploration, to about 1418–1620, a period when European seafarers explored, colonised and conquered regions across the globe.
- Portugal began systematically exploring Africa's Atlantic coast in 1418 under Prince Henry the Navigator; Bartolomeu Dias reached the Indian Ocean in 1488 and Vasco da Gama reached India in 1498.
- The 1494 Treaty of Tordesillas divided newly claimed lands between Portugal and Spain along a line 370 leagues west of the Cape Verde islands.
- The Victoria returned to Spain on 6 September 1522; Wikipedia and the Mariners' Museum both say 18 men completed the first circumnavigation.
- Wikipedia notes that the word 'discovery' itself has been challenged by Indigenous peoples and researchers, and that some scholars prefer 'Age of Contact'.
The Age of Exploration — Wikipedia's main term is the Age of Discovery — runs from about 1418 to 1620, a period in which seafarers from European countries explored, colonised and conquered regions across the globe. Wikipedia credits it with connecting previously isolated parts of the world into a single world-system, and with creating Europe's colonial empires. This guide follows the routes in the order they were opened, then turns to motives and consequences.
Portugal works down the African coast
The opening phase was Portuguese and slow. Wikipedia dates systematic exploration of Africa's Atlantic coast to 1418, under the sponsorship of Prince Henry the Navigator; the Mariners' Museum says that from about 1419 until his death in 1460 he sent several expeditions down the coast, and notes that Henry himself "did not really do much sailing". Wikipedia adds that from 1440 caravels — Iberian ships with a shallow draft useful for exploring coastlines — were used extensively. Cape Verde was reached in 1456 and the Gulf of Guinea in the 1460s.
In 1455 the papal bull Romanus Pontifex granted Portugal all lands and seas discovered beyond Cape Bojador. Exploration and claims to ownership travelled together from the start.
Rounding the Cape, reaching Calicut
Two voyages finished the route east.
Dias, 1487–1488. The Mariners' Museum says Bartolomeu Dias left Lisbon in August 1487 with three ships, was driven south by storms, and on 3 February 1488 reached Mossel Bay, having passed Africa's southern tip. His crew refused to go further. Wikipedia says he named the cape Cabo das Tormentas, "Cape of Storms", and that King John II renamed it the Cape of Good Hope — proving false the view, held since Ptolemy, that the Indian Ocean was landlocked.
Da Gama, 1497–1498. Vasco da Gama sailed from Lisbon on 8 July 1497 with four ships and, according to the museum, 170 men. He rounded the cape on 22 November, hired a pilot at Malindi, and reached India on 20 May 1498 — 316 days after leaving Lisbon. The museum notes that the king of Calicut was not impressed with his gifts, and that da Gama's second voyage, from 1502, involved threats at Kilwa and the bombardment of Calicut. The Indian Ocean trading world he entered is described in Indian Ocean trade before Europeans.
Columbus, and a line down the Atlantic
Spain went west. In 1492 the Catholic Monarchs funded Christopher Columbus's plan to reach the Indies by crossing the Atlantic. Wikipedia notes Portugal had rejected the same idea twice, in 1485 and 1488, and that the continent Columbus reached had been explored and temporarily colonised by the Norse about 500 years earlier.
Rival claims needed a settlement. A papal bull of 4 May 1493 drew a line 100 leagues west of the Azores or Cape Verde. John II of Portugal thought this gave him too little, and negotiated directly with Ferdinand and Isabella. The 1494 Treaty of Tordesillas moved the line to 370 leagues west of the Cape Verde islands, with Portugal taking lands east of it and Spain those to the west. When Pedro Álvares Cabral reached Brazil in 1500, it fell on the Portuguese side. Wikipedia stresses that the division was a geographical definition rather than control on the ground, and that settlements by other European powers ignored it.
Around the world, and the cost of it
The westward route to the Spice Islands produced the first circumnavigation. The two main sources agree on the end of the story but not on its start:
| Detail | Wikipedia | Mariners' Museum |
|---|---|---|
| Departure | 10 August 1519, from Seville | 20 September 1519 |
| Ships | 5 | 5 |
| Crew at start | about 237 European men | roughly 200 men |
| Magellan's death | Battle of Mactan, Philippines | 27 April 1521, Mactan |
| Return of the Victoria | 6 September 1522 | 6 September 1522, 18 men |
The survival rate depends on which starting figure you use: 18 of 237 is 7.6%, while 18 of 200 is 9.0%. Wikipedia adds that 17 more men returned later, including 12 captured by the Portuguese. Both sources name the crew member Antonio Pigafetta, whose journal is the key surviving account. When figures diverge like this, the honest move is to report both, as famous explorers in history does for other expeditions.
Spices, the Ottomans and a disputed motive
Why go at all? The popular answer is that the Ottomans blocked the old routes. The Mariners' Museum puts it this way: the Ottoman Empire controlled almost all European trade routes to Asia and could, and did, charge high prices.
Wikipedia's account is more cautious. It describes Venice and other maritime republics holding a monopoly of European trade with the Middle East from the 8th to the 15th century, with spices among the most expensive products of the Middle Ages, and Muslim traders dominating the Indian Ocean. It notes that overland routes were disrupted as the Mongol states disintegrated — but adds that "European spices have not become more expensive as a result." It also calls the fall of Constantinople in 1453 a perceived blow to Christendom. The desire to bypass intermediaries is well attested; a simple price-shock story is not.
Why some historians avoid the word "discovery"
Wikipedia devotes a section to the term itself. It cites Edmundo O'Gorman's argument that what mattered was Europeans fitting new lands into their worldview — "the invention of America" — and notes that the US Supreme Court's 1823 discovery doctrine used the idea to support colonial land claims, a concept Indigenous peoples and researchers have challenged. Some scholars prefer "Age of Contact".
The consequences named in its summary include the Columbian exchange of plants, animals, people and diseases; rapid declines in some Indigenous American populations; and widespread enslavement and conquest. The Spanish conquest of Mexico (1519–1521) is covered in the Aztec Empire. For an earlier, very different oceanic enterprise, see Zheng He's treasure fleets.
Mapping the routes yourself
World History Timeline Sim, our own app, has a world history map showing where major events happened and timelines you can browse by region or era — useful for keeping Lisbon, Calicut, Hispaniola and the Moluccas in view at once. Time Travel Mode is a different matter: the listing says its chains of consequences are simulations, not what happened, so the simulated aftermath of any voyage is speculation by design. The app is pitched as a companion to coursework rather than a replacement for it, and it will not stand in for a primary account such as Pigafetta's journal. The download is free, supported by ads, with optional in-app purchases; more in education and brain apps.
Good to know
Frequently asked questions
When was the Age of Exploration?
What did the Treaty of Tordesillas divide?
How many of Magellan's sailors survived the circumnavigation?
Why did Portugal want a sea route around Africa?
Sources
- Age of Discovery (opens in a new tab)Wikipedia — accessed
- Vasco da Gama (opens in a new tab)The Mariners' Museum and Park, Ages of Exploration — accessed
- Ferdinand Magellan (opens in a new tab)The Mariners' Museum and Park, Ages of Exploration — accessed
- Bartolomeu Dias (opens in a new tab)The Mariners' Museum and Park, Ages of Exploration — accessed
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