621

Byzantine Empire

 * Emperor invades

Asia

 * —, defeats numerically superior army of.
 * — surrenders to Li Shimin following Dou Jiande's defeat

Religion

 * is said to have visited heaven aboard the steed/unicorn with wings or, in the Isra wal-Miraj, (the ), from Mecca and then to heaven from Jerusalem 's , then back to Mecca.


 * Year 1 of the, the year that Islam began.


 * Year of the Roman  which was in use at the time Christianity's  was written. (In Christianity, 666 is also known as the .)

Births

 * , King of

Deaths

 * , king of the
 * , warlord and opponent of
 * , warlord and opponent of
 * , Chinese general and briefly a chancellor of the