March 28: Teachers’ Day in the Czech Republic; Serfs Emancipation Day in Tibet
- 193 – Praetorian Guards assassinated Roman Emperor Pertinax and sold the throne in an auction to Didius Julianus.
- 1802 – German astronomer Heinrich Wilhelm Matthäus Olbers discovered 2 Pallas, the second asteroid known to man.
- 1942 – World War II: In occupied France, British naval forces successfully disabled the key port of Saint-Nazaire.
- 1979 – A partial core meltdown of the Three Mile Island Nuclear Generating Station (pictured) near Harrisburg, Pennsylvania, U.S., resulted in the release of an estimated 43,000 curies (1.59 PBq) of radioactive krypton to the environment.
- 2003 – Invasion of Iraq: In a friendly fire incident, two members of the United States Air Force attacked the United Kingdom’s Blues and Royals of the Household Cavalry, killing one and injuring five British soldiers.