Template:On this day/21 Mey
- 293 – Roman Emperors Diocletian an Maximian appynt Galerius as Caesar tae Diocletian, beginnin the period o fower rulers kent as the Tetrarchy.
- 1881 – The American Red Cross is established bi Clara Barton in Washington, D.C.
- 1904 – The Fédération Internationale de Football Association (FIFA) is foondit in Paris.
- 1927 – Charles Lindbergh titches doun at Le Bourget Field in Paris, completin the warld's first solo nonstap flicht athort the Atlantic Ocean.
- 1991 – Umwhile Indie Prime Meenister Rajiv Gandhi (picturt) is assassinatit bi a female suicide bomber near Madras.
Albrecht Dürer (b. 1471) · Andrei Sakharov (b. 1921) · Pol Pot (d. 1991)