On January 12, 1519, Hernán Cortés left Santiago de Cuba with roughly 500 men, 11 ships, and 16 horses despite orders revoking his command. His unauthorized voyage set in motion the conquest of the Aztec Empire, one of history's most consequential and brutal collisions between civilizations.

In mid-January 1793, the French National Convention conducted the trial proceedings and votes concerning Louis XVI, debating whether the deposed king should be executed for treason against the Republic. The trial exposed deep divisions among revolutionaries and set a precedent for revolutionary justice against monarchy itself.

Jack London was born on January 12, 1876, in San Francisco, California. He rose from poverty and a brief career as an oyster pirate and Klondike gold prospector to become one of the best-selling and highest-paid authors of his era, famous for adventure fiction rooted in his own hard experience.

On January 12, 1932, voters elected Hattie Caraway to a full Senate term, making her the first woman to win election to the U.S. Senate in her own right after being appointed to fill her deceased husband's seat. She went on to serve until 1945, championing New Deal legislation and equal rights measures.

With Soviet forces closing in from the east, Nazi authorities at Auschwitz began preparations to evacuate the camp on January 12, 1945, launching what became known as the death marches. Roughly 60,000 prisoners were forced westward through snow in thin clothing; thousands died of exposure, exhaustion, or execution along the roads.

On January 12, 1964, revolutionaries led by John Okello overthrew the Sultan of Zanzibar, Jamshid bin Abdullah, ending Arab minority rule over the island in a swift and bloody uprising. The revolution killed thousands and paved the way for Zanzibar's merger with Tanganyika later that year, forming modern Tanzania.

In mid-January 1967, NASA officials outlined an ambitious timetable for achieving a crewed lunar landing before the decade's end, part of the intensive planning underway for the Apollo program. Just over two weeks later, the Apollo 1 fire would kill three astronauts and force a fundamental redesign of the spacecraft.

At 4:53 p.m. on January 12, 2010, a magnitude 7.0 earthquake struck just 25 kilometers from Port-au-Prince, Haiti, collapsing government buildings, hospitals, and homes across the densely populated capital. Estimates of the dead range from 100,000 to over 220,000, making it one of the deadliest earthquakes in modern history.