February 15 in History

A failed steam generator at Indian Point II nuclear power plant vented a small amount of radioactive steam into the air north of New York City. Though the release posed no immediate health risk, the incident reignited public debate over nuclear safety in one of America's most densely populated regions and contributed to the plant's eventual permanent shutdown.

Khosrau II took the Persian throne at 23 after his father was murdered. He'd spend the next 38 years building the largest empire Persia had seen in centuries — conquering Egypt, Jerusalem, and reaching the gates of Constantinople. His treasury held enough gold to mint coins for a generation. Then he lost it all in eight years. A general named Heraclius destroyed his armies, took back everything, and Khosrau was executed by his own son. The collapse was faster than the rise.

Arduin of Ivrea became King of Italy because the German emperor couldn't be bothered to show up. Otto III had died suddenly at 21, leaving no heir, and Italy's nobles weren't waiting around for the next German to claim their throne. They crowned Arduin at Pavia in 1002—a local margrave who'd already been fighting the German-appointed bishops for years. He lasted three years. Henry II marched south with an army, and most of Arduin's supporters switched sides before the battle even started. Arduin died in a monastery. Italy wouldn't have another Italian king for 859 years.

King John of England landed an invasion force at La Rochelle to reclaim territories lost to Philip II of France, opening the southern front of the Anglo-French War. The campaign ultimately failed to recover the lost Angevin lands, and John's costly military adventures abroad drained the English treasury, fueling the baronial unrest that forced him to seal Magna Carta the following year.

Columbus wrote his America letter while still at sea, addressed to nobody in particular. He described gold rivers that didn't exist, docile natives who'd make excellent slaves, and spices he couldn't identify. It was printed in nine cities within months — Europe's first viral marketing campaign. He'd found islands, not Asia. He knew it. The letter claimed otherwise. Every subsequent voyage tried to make the letter true.

Constantin Cantemir signed a treaty in Sibiu that Moldavia couldn't honor. The Prince promised Habsburg troops, supplies, and safe passage through his territory to fight the Ottomans. But Moldavia was an Ottoman vassal state. The Ottomans had installed him. They could remove him. He was promising to betray the empire that controlled his throne. The treaty stayed secret for good reason. When the Ottomans eventually discovered similar dealings by his son Dimitrie thirty years later, they abolished Moldavian autonomy entirely. The principality lost the right to choose its own rulers for over a century. Constantin was betting the Habsburgs would win quickly enough to protect him. They didn't.

French troops marched into Rome on February 10, 1798. Five days later, the Pope's thousand-year temporal power ended with a proclamation. General Louis Alexandre Berthier — Napoleon's chief of staff, not even the main commander — declared Rome a republic. Pope Pius VI was 81 years old. The French gave him three days to leave. He died in French captivity eighteen months later, in Valence, never having returned. The Papal States had governed central Italy since 756. They wouldn't return to full power until 1815, and even then, never the same. Napoleon's army toppled a millennium of papal rule as a side project between bigger campaigns.

The Helsinki Cathedral took 30 years to build and opened empty. No congregation. Finland was under Russian rule, and Tsar Nicholas I wanted a statement — a massive neoclassical dome visible from the sea, announcing imperial power. The architect, Carl Ludvig Engel, died before it was finished. When it finally opened in 1852, it was a Lutheran church named for an Orthodox saint. After independence in 1917, they dropped "St. Nicholas" entirely. Now it's just "Helsinki Cathedral" — the empire's symbol, stripped of the empire.

Grant nearly lost Fort Donelson before he won it. Confederate General John B. Floyd broke through Union lines on February 15, 1862 — had an open escape route to Nashville with 12,000 men. Then he hesitated. Called a council of war. Argued for hours. By morning, Grant had reinforced the gap. Floyd fled by steamboat before dawn, taking two regiments with him. His second-in-command also escaped. The third officer, Simon Buckner, was left to surrender 13,000 men. Grant's terms: "No terms except unconditional and immediate surrender." It made him famous. Floyd died eighteen months later, disgraced and forgotten. Grant became president.

Stevens Institute of Technology opened in Hoboken with money from a single family — Edwin Stevens left his entire fortune to build an engineering school. His will specified mechanical engineering as the core program. In 1870, no American college offered a bachelor's degree in mechanical engineering. Students learned Latin and philosophy, not machine design. Stevens changed that. Within a decade, MIT and Cornell copied the model. American industry needed engineers who could actually build things, not just theorize about them.