Hernán Cortés with 600 men and 16 horses overthrew the Aztec empire. This illustration of the conquistador was made from life.

The map traces his route from the coast to Tenochtitlán in 1519.

Marina was a Nahua, or Aztec. While in captivity she too had learned the Mayan tongue and could converse with the rescued Spaniard. Through this linguistic conduit, the conquistadores received exciting information about Tenochtitlán, the glittering city of the Aztecs, predecessor of today’s Mexico City. A dazzling prize! And why, Cortés surely wondered, should he share any of it with Diego Velásquez, sitting safely at home in Cuba?

On April 21, 1519, the fleet dropped anchor at the sea end of a trail leading to the city. There Cortés laid the foundations of a port that he named Vera Cruz (today Veracruz). Calling his men together—they, too, were excited about prospects—he prevailed on the majority to elect him captain-general of the expedition, a move that in Cortés’s mind freed him of his obligations to Velásquez and made him answerable only to King Charles V. Simultaneously, he sent emissaries to Moctezuma, emperor of the Aztecs, asking for an audience.

The timing could hardly have been more propitious. The Aztec rule was harsh; subject nations seethed with discontent; Tenochtitlán itself was torn with dissensions. Fearful that the strangers might be able to capitalize on the undercurrents of the rebellion—and fearful, too, that the newcomers might somehow be descendants of the ancient serpent-god, Quetzalcoatl—Moctezuma tried to buy off the Spaniards. Down to Veracruz went five noble diplomats accompanied by 100 porters laden with treasure. All of it was breathtaking, but what really dumbfounded the Spaniards were two metal disks the size of cartwheels. One, representing the Sun God, was of solid gold. The other, dedicated to the Moon, was of silver.

Cortés declined to respond as expected. He loaded the treasure onto one of his ships and ordered the captain to sail directly to Spain, where he would use the booty to win the approval of Charles V. The rest of the ships he burned so that none of the men in the command who were still loyal to Velásquez could return to Cuba and stir up trouble there. As for his own men, they too would fight harder if they knew that no ships were waiting to evacuate them if they were defeated.

Xipe Totec, Aztec god of fertility, one of many gods in the Aztec pantheon, redrawn from the original codex. He wears the flayed skin of a sacrificial victim. Ritual killing horrified Spaniards and in their eyes justified the conquest. But to Aztecs the gods and their extravagant costumes were an important part of everyday life, condensations of vital social truths.

In November 1519, Tenochtitlán capitulated after a short, hard fight. Cortés took Moctezuma hostage and then paused to contemplate his enormous prize.