Events in History
- Dec 3 Illinois becomes 21st state USA (Admission day)
- Dec 25 1st known Christmas carol ("Silent Night, Holy Night" - "Stille Nacht, Heilige Nacht) sung (Austria)
- Dec 25 Handel's Messiah, premieres in the US in Boston
Birthdays in History
Mary Todd Lincoln
Dec 13 Mary Todd, American wife of Abraham Lincoln and US First Lady (1861-65), born in Lexington, Kentucky (d. 1882)

Mary Todd Lincoln
- Dec 21 Amalia, wife of king Otto of Greece
- Dec 21 Lewis H. Morgan, American ethnologist (Systems of Consanguinity), born in Aurora, New York (d. 1881)
- Dec 23 David Addison Weisiger, Brigadier General (Confederate Army), (d. 1899)
- Dec 24 James Prescott Joule, English physicist (the law of conservation of energy), born in Salford, United Kingdom (d. 1889)
- Dec 30 James Cantey, Brigadier General (Confederate Army), (d. 1874)
Deaths in History
- Dec 5 Bruno Daalberg/Anonymus Belga, sect of High Council Adel, dies at 60