The Rus' Khaganate started the Siege of Constantinople.
Halley's Comet made its closest approach to Earth in recorded history.
Pope Paschal I crowned Lothair I as the Emperor of Italy.
King Louis the Pious was crowned emperor of the Holy Roman Empire by the Pope.
The Queen Adosinda of Asturias was placed in a convent at San Juan de Pravia for the rest of her life.
The oldest known recording of a solar eclipse from China was reported.
Following the fall of the Umayyads, the city of Baghdad, Iraq, was founded by caliph Al-Mansur the Islamic Ruler.
Romulus and Remus founded the city of Rome.
Pope Constantine died.
The oldest Japanese coinage was minted.
Pope Sergius I consecrated Willibrord as bishop of the Frisians at the Church of Santa Cecilia in Trastevere in Rome, Italy.
Empress Wu Zetian proclaimed herself ruler of the Chinese Empire.
The Pictish armies of King Bridei Mac Bili won a decisive victory over the armies of Northumbria at the Battle of Dun Nechtain.
The Kaaba caught fire and was burned down during the Siege of Mecca.
Pope Leo II became the bishop of Rome.
Chinese and Korean forces won the two-day Battle of Baekgangon.
Japan was founded by its legendary first emperor, Emperor Jimmu.
The Great Fire of Rome started when the merchant shops around the Circus Maximus caught fire.
A fire broke out in the evening and swept through the city of Rome, which lasted longer than a week.
The journey of the Islamic prophet Muhammad and his followers began. This was known as the Hijrah.
Yohl Ik'nal ascended to the throne of Palenque, making her the first queen regnant in Maya history.
Justin II of Byzantine adopted Tiberius, his general, and proclaimed him Caesar.
The capital city of the Roman Empire, Constantinople, was severely damaged by an earthquake.
Hagia Sophia was inaugurated by the Emperor Justinian I as an Eastern Orthodox cathedral.
Thespis of Icaria, an ancient Greek poet, became the first recorded person to act out a character in a play.
Mercurius became Pope John II, making him the first pope to change their name after attaining popehood.
The most destructive riot in Constantinople's history, the Nika Riots, began during a chariot race.
Saint John I became the Catholic Pope.
The festival of Saturnalia was first celebrated after a temple to the Roman god Saturn was built in Rome.
Anastasius I Dicorus ascended to the throne of the Byzantine Empire at the age of sixty-one.
The Greeks defeated the Persians in the Battle of Marathon.
Leo II was crowned Emperor of Rome at just seven years of age.
Pope Hilarius became the Bishop of Rome.
Saint Patrick was captured by Irish raiders from his home in Britain and taken to be a slave in Ireland.
The Peloponnesian war came to an end when Admiral Lysander and his Spartan armies defeated their Athenian foes.
A monk put an end to gladiator fighting in Rome.
Pope Innocent I was elected.
Pope Anastasius I became the Bishop of Rome, reigning until his death.
The Greek philosopher Socrates was sentenced to death for corrupting the minds of Athens's youth.
The Alemanni crossed the frozen Rhine in large numbers and invaded the Roman Empire.
The estimated magnitude 8.0 earthquake caused the island of Crete to rise 30 feet (9 meters) above sea level.
Roman Emperor Valentinian I made his brother, Flavius Valens, his co-emperor.
Valentinian I, also known as Valentinian the Great, ascended to the throne as the Roman emperor.
Emperor Constantius II was baptized on his deathbed hours before passing.
The Temple of Artemis, one of the Seven Wonders of the World, was set on fire by Herostratus.
Roman general Claudius Silvanus fraudulently proclaimed himself Roman emperor and was hacked to death.
Christmas was celebrated in Rome, marking the first time in recorded history that the holiday was celebrated.
The doctrine of the Holy Trinity was established after the end of the Council of Nicaea.
The first Christian ecumenical council opens at Nicaea, Asia Minor. It was the first attempt to achieve agreement in the church.
Roman Emperor Constantine had his Vision of the Cross.
