December 6 is the 340th day of the year (341st in leap years) in the Gregorian calendar; 25 days remain until the end of the year. == Events == === Pre-1600 === 1060 – Béla I is crowned king of Hungary. 1240 – Mongol invasion of Rus': Kyiv, defended by Voivode Dmytro, falls to the Mongols under Batu Khan. 1492 – After exploring the island of Cuba (which he had mistaken for Japan) for gold, Christopher Columbus lands on an island he names Hispaniola. 1534 – The city of Quito in Ecuador is fo…