Wikipedia:Selected anniversaries/August 12
August 12: Mother's Day in Thailand; International Youth Day.
- 1099 - The First Crusade concluded with the Battle of Ascalon and Fatimid forces under Al-Afdal Shahanshah retreating to Egypt.
- 1121 - Forces led by David the Builder (pictured) decisively won the Battle of Didgori, driving Ilghazi and the Seljuk Turks out of Georgia.
- 1851 - Isaac Singer was granted a patent for his sewing machine.
- 1877 - Asaph Hall discovered Deimos, the smaller of the two moons of Mars.
- 1953 - History of nuclear weapons: The first Soviet thermonuclear bomb, Joe 4, was detonated at Semipalatinsk, Kazakh SSR.