The Portuguese maritime expansion: the great voyages — History, 11–13
How Portugal, a small kingdom on the edge of the Atlantic, opened sea routes never before travelled by Europeans.
A project spanning several generations
From the early 15th century, driven by Prince Henry, Portuguese navigators began exploring the African coast, advancing little by little, year after year. Decades later, under King John II, this work continued, with better maps, better ships and more experience of winds and sea currents.
Why it was a process, not a single feat
It's tempting to think of the maritime expansion as one great adventure led by a single hero. But it was, in fact, a project spanning several generations — of kings, navigators, cartographers and anonymous sailors — that depended on knowledge built up over decades: how to build better ships, how to read the winds, how to use new navigation instruments.
A case: the sea route to India
Step 1: for decades, Portuguese navigators slowly advance along the African coast, mapping the coastline. Step 2: in 1488, Bartolomeu Dias rounds the southern tip of Africa. Step 3: in 1497-98, Vasco da Gama completes the voyage to India, sailing round Africa and crossing the Indian Ocean. Step 4: in 1500 Pedro Álvares Cabral reaches Brazil; in 1519 Ferdinand Magellan, a Portuguese navigator in the service of the Spanish Crown, sets out on the voyage that would complete the first circumnavigation of the world.
The trap: thinking it was just luck or courage
It's easy to reduce these voyages to stories of personal courage. But behind every crossing were decades of accumulated technical knowledge: increasingly accurate maps, instruments like the astrolabe, and ships like the caravel, specifically designed to handle difficult winds and currents. Without that knowledge, courage alone would not have got anyone anywhere.
Where you can still see this today
You see this history in street names and monuments across the country — the Monument to the Discoveries, in Lisbon, is one example — and in the fact that Portuguese is spoken today on several continents. Museums such as the Navy Museum also tell this story, holding real instruments and maps from this period.
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