What is March 21?
{{calendar}} {{day}} It is the traditional date of the [[March]] [[equinox]], although it often falls on [[March 20]]. == Events == === Up to 1900 === * [[537]] &ndash; [[Siege of Rome]]: King [[Vitiges]] attempts to assault the northern and eastern [[city]] walls, but is prevented from doing so at the [[Praenestine Gate]], known as [[Vivarium]], by the defenders under [[Byzantine Empire|Byzantine]] generals [[Bessas]] and [[Peranius]]. * [[1152]] &ndash; The [[marriage]] of King [[Louis VII of France]] and Queen [[Eleanor of Aquitaine]] is annulled, meaning that their marriage is no longer recognized. * [[1188]] &ndash; [[Emperor Antoku]] comes to the throne of [[Japan]]. * [[1556]] &ndash; In [[Oxford]], [[Archbishop of Canterbury]] [[Thomas Cranmer]] is [[Execution by burning|burned at the stake]]. * [[1684]] &ndash; [[Giovanni Domenico Cassini]] discovers [[Saturn (planet)|Saturn]]'s [[moon]]s [[Tethys (moon)|Tethys]] and [[Dione (moon)|Dione]]. * [[1784]] &ndash; [[William Herschel]] discovers the NGC 4379 and NGC 3370 [[Galaxy|Galaxies]]. * [[1788]] &ndash; A [[fire]] destroys 856 buildings in [[New Orleans]] and leaves most of the town in ruins. * [[1800]] &ndash; With the church leadership driven out of the [[Vatican]] during an armed conflict, [[Pope Pius VII|Pius VII]] was [[Papal Coronation|crowned Pope]] in [[Venice]] with a temporary [[Papal Tiara|papal tiara]] made of [[papier-mâché]]. * [[1800]] &ndash; The [[Republic]] of the [[Ionian Islands]] is founded. Currently, the islands are part of [[Greece]]. * [[1801]] &ndash; The [[Battle of Alexandria]] was fought between [[United Kingdom|British]] and [[France|French]] forces near the ruins of [[Nicopolis]] in [[Egypt]]. * [[1804]] &ndash; [[Napoleonic code|Code Napoléon]] was adopted as [[France|French]] [[civil law]]. * [[1814]] &ndash; [[Napoleonic Wars]]: [[Austria]]n forces repel French troops in the [[Battle of Arcis-sur-Aube]]. * [[1844]] &ndash; The [[Baha'i]] [[calendar]] begins. * [[1846]] &ndash; [[Adolphe Sax]] receives a [[patent]] for