1449
Tumu Crisis
The young Ming Zhengtong Emperor, goaded by his eunuch Wang Zhen, led an army north against Esen's Oirat Mongols and was captured alive when his camp was surrounded at Tumu fortress. Half the imperial cavalry died. China's northern prestige collapsed. The emperor was eventually ransomed, placed under house arrest, and later restored.
Ulugh Beg Assassinated by His Son
The astronomer-prince of Samarkand, whose star catalogue rivaled Ptolemy's in precision and whose sextant was the largest astronomical instrument on earth, was ambushed and beheaded by his own son Abd al-Latif on a road outside the city walls. His observatory fell into disuse within months, its great arc eventually buried under rubble and windblown soil. The Timurid Renaissance had produced its finest scientist and then murdered him for political convenience.
French Recover Rouen
Charles VII's army entered Rouen, the Norman capital where Joan of Arc had been burned eighteen years earlier. The English administration surrendered. Normandy, held since Henry V's conquest, was French again within two years. The closing phase of the Hundred Years' War accelerated into a French sweep across the west.
Yu Qian Defends Beijing from Mongols
With the Zhengtong Emperor captured at Tumu, the Ming minister of war Yu Qian rallied the panicking capital's defense, installed the emperor's younger brother on the throne as a replacement, and repelled Esen Taishi's Mongol cavalry from Beijing's walls in days of fierce fighting. His decisive leadership saved the dynasty from collapse, but when the original emperor was restored to power years later, Yu Qian was executed for treason as reward for his trouble.