Wikipedia:Selected anniversaries/April 21
April 21: First day of Festival of Ridván in the Bahá'í Faith, Tiradentes Day in Brazil.
- 753 BC - Romulus and Remus founded Rome, according to the calculations by Varro Reatinus.
- 1836 - Texan forces led by Sam Houston defeated General Antonio López de Santa Anna and his Mexican troops in the Battle of San Jacinto, the decisive battle in the Texas Revolution.
- 1960 - Brasília, a planned city based on principles of Le Corbusier, was officially inaugurated as the capital of Brazil.
- 1966 - Emperor Haile Selassie I of Ethiopia (pictured) visited Jamaica and was greeted by more than a hundred thousand Rastafarians.
- 1967 - Colonel Georgios Papadopoulos overthrew the government of Prime Minister Panagiotis Kanellopoulos, establishing the Regime of the Colonels in Greece.