February 21: Washington’s Birthday/Presidents’ Day in the United States (2011); Family Day in various regions of Canada (2011); International Mother Language Day; Language Movement Day in Bangladesh
- 1245 – Thomas, the first known Bishop of Finland, was granted resignation by Pope Innocent IV after having confessed to torture and forgery.
- 1543 – Battle of Wayna Daga: Led by the Emperor Galawdewos, the combined army of Ethiopian and Portuguese troops defeated a Muslim army led by Imam Ahmad ibn Ibrihim al-Ghazi.
- 1919 – Bavarian socialist Kurt Eisner (pictured), who had organized the Socialist Revolution that overthrew the Wittelsbach monarchy and established Bavaria as a republic, was assassinated.
- 1971 – The Convention on Psychotropic Substances, a United Nations treaty designed to control psychoactive drugs, was signed at a conference of plenipotentiaries in Vienna.