February 23 in History

J. S. Bach performed his secular Shepherd Cantata as Tafel-Music to celebrate the birthday of Christian, Duke of Saxe-Weissenfels, blending pastoral charm with the complex vocal writing that defined his genius. The piece demonstrated Bach's ability to craft music equally at home in court entertainment and sacred worship, showcasing the range that made him the supreme composer of the Baroque era.

Diocletian's soldiers arrived at the church in Nicomedia on February 23, 303, stripped the building, and burned every manuscript they could find. No bloodshed that day — just erasure. The emperor wanted Christianity gone without making martyrs. It backfired spectacularly. The persecution lasted eight years, killed thousands, and created so many martyrs that Christianity spread faster than before. Within a decade of Diocletian's retirement, Constantine legalized it. Twenty years after that, it was the empire's dominant religion.

Justinian ordered the Hagia Sophia built after rioters burned down the previous church during the Nika riots — the same riots where he nearly fled the city until his wife Theodora, a former actress, convinced him to stay and crush the rebellion. Thirty thousand died. He used the rubble as foundation for the new basilica. It took five years, ten thousand workers, and the empire's entire annual revenue. The dome was so massive engineers didn't think it would stand. It did. For 900 years, it was the largest cathedral in the world.

Lautaro had been a Spanish stable boy. He'd fed their horses, watched their drills, learned how they fought. At Marihueñu, he used that knowledge. He let the Spanish cavalry charge into swampland where their horses couldn't maneuver. Then he attacked from three sides. The Spanish commander died in the mud. Spain lost control of southern Chile for three centuries. The Mapuche remained independent longer than any indigenous group in the Americas.

The Continental Army couldn't march in formation. Soldiers loaded muskets differently in every regiment. They didn't know how to use bayonets, so they threw rocks. Baron von Steuben arrived at Valley Forge in February 1778 and wrote a drill manual in French. His translator turned it into English. His assistant translated it into broken English the troops could actually understand. He trained one model company, then those men trained their regiments. Within months, Washington had an army that could stand against British regulars. A Prussian officer saved the Revolution with a pamphlet.

Twenty-three men planned to murder the entire British cabinet at a dinner party. They'd storm Lord Harrowby's house on Grosvenor Square, kill everyone inside, then march on the Bank of England and the Tower of London. Arthur Thistlewood, the leader, wanted to start a revolution. He'd bought grenades and built a ladder for the attack. But one of his men was a government spy. Police raided their meeting place on Cato Street the night before. Five conspirators were hanged. Five more transported to Australia. The dinner party they planned to attack? It was fake. The government had planted the invitation in a newspaper to draw them out.

President-elect Abraham Lincoln slipped into Washington disguised in a soft hat and overcoat after detective Allan Pinkerton uncovered an assassination plot in Baltimore. The secret overnight train ride drew mockery from political opponents but revealed the genuine danger Lincoln faced even before taking office, foreshadowing the assassination that would claim his life four years later.

Mississippi rejoined the Union in 1870 — last of the Confederate states to do so. The delay wasn't military. It was the Fifteenth Amendment. Congress required ratification before readmission. Mississippi's legislature refused. Twice. Then they calculated: stay out or swallow the amendment. They chose in. Within three years, white supremacists had violently overthrown the biracial government they'd been forced to accept. The amendment stayed on paper. The state wouldn't seriously enforce it for another century.

French forces took Đồng Đăng on February 23, 1885, pushing China out of northern Vietnam for good. The battle lasted three days. Chinese troops abandoned artillery, supply depots, and their main defensive line near the border. France lost 80 men. China lost its claim to Vietnam as a tributary state. The treaty came four months later: China recognized French control of Tonkin, ending centuries of influence over its southern neighbor. Vietnam wouldn't be independent again for seventy years, but it wouldn't be Chinese either. One battle settled what diplomacy couldn't — who controlled Southeast Asia's northern coast.

Charles Martin Hall was 22 when he figured out how to make aluminum cheap. Before 1886, aluminum cost more than gold — $15 per pound. It was so rare Napoleon III served his most important dinner guests with aluminum forks while everyone else got silver. Hall's process used electricity to extract pure aluminum from bauxite ore. Within a decade, the price dropped to 50 cents per pound. His sister Julia ran hundreds of experiments with him in their woodshed laboratory, mixing compounds and testing voltages. She never got credit in the patent. Today we wrap sandwiches in what emperors couldn't afford.