Motives, Enablers and the Portuguese Push South

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Religion (spreading Christianity, finding Prester John); Rivalry (national competition, personal ambition); Knowledge (humanist curiosity, recovering classical geography); Trade (bypassing Ottoman middlemen for spices and gold). Shortcut: R-R-K-T.

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It strengthened Ottoman control over the overland spice routes (the Silk Road), making eastern goods more expensive and less reliable for Western European merchants — intensifying pressure to find a direct sea route to Asia.

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Prince Henry of Portugal (1394–1460). He never sailed himself but organised and funded systematic Portuguese voyages down the West African coast from the 1420s onward, gathering cartographers and pilots at Sagres. He gave Portugal a decades-long head-start over rival states.

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Its lateen (triangular) sails could sail closer to the wind than square-rigged ships, making the northward return voyage against the Atlantic trade winds feasible. It was also light and shallow-draughted, ideal for exploring unknown coastlines.

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Gil Eanes, on his fifteenth attempt commissioned by Henry the Navigator, sailed around the cape and returned safely. This broke the psychological barrier — sailors had believed the waters beyond were impassable. Every subsequent Portuguese voyage went further south.

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1. The astrolabe — measured sun/star altitude to calculate latitude. 2. The magnetic compass — gave reliable direction away from land. 3. Portolan charts — detailed coastal maps extended to newly explored regions. Together they made leaving the coastline survivable.

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It carried the first African gold and enslaved people to Portugal — proving the commercial model worked. It marked the beginning of what would grow into the Atlantic slave trade and gave investors confidence to fund further voyages.

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A Portuguese fortified trading post (feitoria) established in 1482 on the Gold Coast (modern Ghana). It was the first European fort in sub-Saharan Africa and became the model for the network of coastal trading posts Portugal and later other European powers used to control maritime trade.

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He rounded the Cape of Good Hope, proving Africa had a southern tip and that the Indian Ocean was reachable by sea from Europe. This opened the way for Vasco da Gama's 1498 voyage to India, which broke the Ottoman monopoly on eastern trade.

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Portugal: became Europe's wealthiest state by 1500 via African gold, slaves, and later Asian spices; Lisbon replaced Venice as Europe's commercial hub. Castile: alarmed by Portuguese success, began funding its own explorers — ultimately commissioning Columbus in 1492 — triggering the rivalry that produced the Treaty of Tordesillas (1494).

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A Portuguese royal trading house established in Lisbon (1452) to manage and profit from African trade. It organised the import of gold, ivory, and enslaved people from West Africa and gave the Portuguese crown direct control over exploration revenues.

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Acknowledge his clear contribution (sustained funding, Sagres organisation, decades-long head-start for Portugal). Then test limits: structural pressures existed independently; the programme continued after his death; Castile faced identical pressures. Conclude: Henry was the most important individual factor but an accelerator of pre-existing forces, not their sole cause.