Births on April 21

Allan Watkins, Welsh-English cricketer (d. 2011)

Albert John "Allan" Watkins (21 April 1922 – 3 August 2011) was a Welsh cricketer, who played for England in fifteen Tests from 1948 to 1952.

11 Jan

Diabetes mellitus
First use of insulin to treat diabetes in a human patient.
2 Feb

James Joyce
Ulysses by James Joyce is published.
13 Sep

Great Fire of Smyrna
The final act of the Greco-Turkish War, the Great Fire of Smyrna, commences.
4 Nov

Tutankhamun
In Egypt, British archaeologist Howard Carter and his men find the entrance to Tutankhamun's tomb in the Valley of the Kings.
24 Nov

Executions during the Irish Civil War
Nine Irish Republican Army members are executed by an Irish Free State firing squad. Among them is author Robert Erskine Childers, who had been arrested for illegally carrying a revolver.