- 1565 Compromise of the Nobles in Habsburg Netherlands closes against inquisition
- 1814 Treaty of Ghent signed, ending the War of 1812 between the United States, the United Kingdom and their allies
- 1936 1st radioactive isotope medicine administered in Berkeley, California
- 1943 US President FDR appoints General Eisenhower Supreme Commander of the Allied forces
Christmas carol "Silent Night" composed by Franz Xaver Gruber is first sung at St Nicholas parish church in Oberndorf, Austria
On December 24, 1818
Private companies allowed to use the word "postcard" in the US. Previously they were labelled "Private Mailing Cards" and known as "souvenir cards".
On December 24, 1901