December 6 is the 340th day of the year (341st in leap years) in the Gregorian calendar. There are 25 days remaining until the end of the year.
Events:
1060 – Béla I is crowned King of Hungary.
1240 – Mongol invasion of Rus': Kiev under Daniel of Galicia and Voivode Dmytro falls to the Mongols under Batu Khan.
1534 – The city of Quito in Ecuador is founded by Spanish settlers led by Sebastián de Belalcázar.
1648 – Colonel Thomas Pride of the New Model Army purges the Long Parliament of MPs sympathetic to King Charles I of England, in order for the King's trial to go ahead; came to be known as "Pride's Purge".
1704 – Battle of Chamkaur (1704): During the Mughal-Sikh Wars, an outnumbered Sikh Khalsa defeats a Mughal army.
1745 – Charles Edward Stuart's army begins retreat during the second Jacobite Rising.
1768 – The first edition of the Encyclopædia Britannica is published.
1790 – The U.S. Congress moves from New York City to Philadelphia.
1865 – The Thirteenth Amendment to the United States Constitution is ratified, banning slavery.
1877 – The first edition of The Washington Post is published.