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February 29, also known as leap day or leap year day, is a date added to most years that are divisible by 4, such as 2016, 2020, and 2024. A leap day is added in various solar calendars (calendars based on the Earth’s revolution around the Sun), including the Gregorian calendar standard in most of the world. Lunisolar calendars (whose months are based on the phases of the Moon) instead add…
For superstitious reasons, when the Romans began to intercalate to bring their calendar into line with the solar year, they chose not to place their extra month of Mercedonius after February but within it. February 24 — known in the Roman calendar as “the sixth day before the Kalends of March” — was replaced by the first day of this month since it…
February 19 in History 197 – Emperor Septimius Severus defeats usurper Clodius Albinus in the Battle of Lugdunum, the bloodiest battle between Roman armies. 356 – Emperor Constantius II issues a decree closing all pagan temples in the Roman Empire. 1594 – Having already been elected to the throne of the Polish–Lithuanian Commonwealth in 1587, Sigismund III of the House of Vasa is crowned King of Sweden, having succeeded his father John III of Sweden in 1592….
February 18 in History 1229 – The Sixth Crusade: Frederick II, Holy Roman Emperor, signs a ten-year truce with al-Kamil, regaining Jerusalem, Nazareth, and Bethlehem with neither military engagements nor support from the papacy. 1268 – The Battle of Wesenberg is fought between the Livonian Order and Dovmont of Pskov. 1332 – Amda Seyon I, Emperor of Ethiopia begins his campaigns in the southern Muslim provinces. 1478 – George, Duke of Clarence, convicted of treason against his older brother Edward IV of England, is executed in private…
February 1 in History 1327 – The teenaged Edward III is crowned King of England, but the country is ruled by his mother Queen Isabella and her lover Roger Mortimer. 1411 – The First Peace of Thorn is signed in Thorn (Toruń), Monastic State of the Teutonic Knights (Prussia). 1662 – The Chinese general Koxinga seizes the island of Taiwan after a nine-month siege. 1713 – The Kalabalik or Skirmish at Bender results from the Ottoman sultan’s order that…
January 29 in History 904 – Sergius III is consecrated pope, after coming out of retirement to take over the papacy from the deposed antipope Christopher. 946 – Caliph Al-Mustakfi is blinded and deposed by Emir Mu’izz al-Dawla, ruler of the Buyid Empire. He is succeeded by Al-Muti as caliph of the Abbasid Caliphate. 1258 – First Mongol invasion of Đại Việt: Đại Việt defeats the Mongols at the battle of Đông Bộ Đầu, forcing the…
January 25 in History AD 41 – After a night of negotiation, Claudius is accepted as Roman Emperor by the Senate. 750 – In the Battle of the Zab, the Abbasid rebels defeat the Umayyad Caliphate, leading to overthrow of the dynasty. 1348 – A strong earthquake strikes the South Alpine region of Friuli in modern Italy, causing considerable damage to buildings as far away as Rome. 1494 – Alfonso II becomes King of Naples. 1515 – Coronation of Francis…
January 22 in History 613 – Eight-month-old Constantine is crowned as co-emperor (Caesar) by his father Heraclius at Constantinople. 871 – Battle of Basing: The West Saxons led by King Æthelred I are defeated by the Danelaw Vikings at Basing. 1506 – The first contingent of 150 Swiss Guards arrives at the Vatican. 1517 – The Ottoman Empire under Selim I defeats the Mamluk Sultanate and captures present-day Egypt at the Battle of Ridaniya. 1555 – The Ava Kingdom falls to the Taungoo Dynasty in what is now Myanmar….
January 18 in History 474 – Seven-year-old Leo II succeeds his maternal grandfather Leo I as Byzantine emperor. He dies ten months later. 532 – Nika riots in Constantinople fail. 1126 – Emperor Huizong abdicates the Chinese throne in favour of his son Emperor Qinzong. 1486 – King Henry VII of England marries Elizabeth of York, daughter of Edward IV uniting the House of Lancaster and the House of York. 1562 – Pope Pius IV reopens the Council of Trent for its third and final…
January 3 in History 250 – Emperor Decius orders everyone in the Roman Empire (except Jews) to make sacrifices to the Roman gods. 1521 – Pope Leo X excommunicates Martin Luther in the papal bull Decet Romanum Pontificem. 1653 – By the Coonan Cross Oath, the Eastern Church in India cuts itself off from colonial Portuguese tutelage. 1749 – Benning Wentworth issues the first of the New Hampshire Grants, leading to the establishment of Vermont. 1749 –…