Over the Edge of the World: Magellan's Terrifying Circumnavigation of the Globe

by Laurence Bergreen

Reliable information about trade routes was so sensitive and precious that governments zealously guarded all maps and charts, which were essential to national security, and for Magellan to display a map likely purloined from Portugal was the equivalent of selling nuclear secrets at the height of the Cold War.

An unauthorized individual caught with a chart could be punished severely, even with death. They were kept under lock and key, and under armed guard.

Cheng Ho’s voyages demonstrated that China was once the most powerful nation in the world, a seagoing empire that Spain or Portugal would have feared and envied, had they known of its reach. The reputation of the Treasure Fleet never made it to European shores. Portuguese and Spanish explorers sailed into the vacuum of power left by China. Like the Chinese, they came in search of wealth, but quite unlike them, they fiercely battled for territory, for commercial and political advantage over one another, and for religious conquest.