December 31 is the 365th day of the year (366th in leap years) in the Gregorian calendar.
It is widely known as New Year's Eve since the following day is New Year's Day. It is the last day of the year. The following day is January 1 of the following year.
Events：
406 – Vandals, Alans and Suebians cross the Rhine, beginning an invasion of Gaul.
535 – Byzantine general Belisarius completes the conquest of Sicily, defeating the Gothic garrison of Palermo(Panormos), and ending his consulship for the year.
1225 – The Lý dynasty of Vietnam ends after 216 years by the enthronement of the boy emperor Trần Thái Tông, husband of the last Lý monarch, Lý Chiêu Hoàng, starting the Trần dynasty.
1229 – James I of Aragon the Conqueror enters Medina Mayurqa (now known as Palma, Spain) thus consummating theChristian reconquest of the island of Majorca.
1501 – The First Battle of Cannanore commences.
1600 – The British East India Company is chartered.
1660 – James II of England is named Duke of Normandy by Louis XIV of France.
1687 – The first Huguenots set sail from France to the Cape of Good Hope.
1696 – A window tax is imposed in England, causing many householders to brick up windows to avoid the tax.
1757 – Empress Elizabeth I of Russia issues her ukase incorporating Königsberg into Russia.
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