Angilbert was the Homer of the emperor's literary circle, and was the probable author of an epic, of which the fragment which has been preserved describes the life at the palace and the meeting between Charlemagne and Leo III.

The Byzantine emperor Leo III after his victory over Arab besiegers in 740 renamed the city Nicopolis ( Greek for " city of victory ").

This was followed in the east by the Ecloga of Leo III the Isaurian ( 740 ) and the Basilica of Basil I ( 878 ).

In the 730s Leo III carried out extensive repairs of the Theodosian walls, which had been damaged by frequent and violent attacks ; this work was financed by a special tax on all the subjects of the Empire.

The emperor Leo III issued a decree in 726 against images, and ordered the destruction of a statue of Christ over one of the doors of the Chalke, an act that was fiercely resisted by the citizens.

The canonization of Saint Udalric, Bishop of Augsburg, by Pope John XV in 999 is the first undoubted example of a papal canonization of a saint from outside Rome ( Some historians maintain that the first such canonization was that of Saint Swibert by Pope Leo III in 804 ).

The first computer using a multiprogramming system was the British Leo III owned by J. Lyons and Co .. Several different programs in batch were loaded in the computer memory, and the first one began to run.

* 800 – Charlemagne judges the accusations against Pope Leo III in the Vatican.

The Holy Roman Empire looked to Charlemagne, Charles the Great, King of the Franks, as its founder, who had been crowned Emperor of the Romans on Christmas Day in 800 by Pope Leo III.

Hoping to avoid the sack of Rome herself, Emperor Valentinian III sent three envoys, the high civilian officers Gennadius Avienus and Trigetius, as well as the Bishop of Rome Leo I, who met Attila at Mincio in the vicinity of Mantua, and obtained from him the promise that he would withdraw from Italy and negotiate peace with the emperor.

In recognition of his successes and his political support for the Papacy, Charlemagne was crowned Emperor of the Romans, or Roman Emperor in the West, by Pope Leo III in 800.

In that year the iconoclast Byzantine emperor Leo III, angered by archbishops of the region because they had supported Rome in the Iconoclastic Controversy, detached the church of the province from the Roman pope and placed it under the patriarch of Constantinople.

The Iconoclastic Period began when images were banned by Emperor Leo III the Isaurian sometime between 726 and 730.

In the Byzantine Empire, iconoclasm began with Emperor Leo III.

Sometime between 726 and 730, the Byzantine Emperor Leo III the Isaurian began the iconoclast campaign.

* 816 – Pope Leo III ( b. 750 )

** Pope Leo III

** Pope Leo III

In 816, Pope Stephen IV, who had succeeded Leo III, visited Reims and again crowned Louis.

On his deposition Leo joined with his colleague Artabasdus, the stratēgos of the Armeniac theme, in conspiring to overthrow the new Emperor Theodosius III.

A Leo III base gold solidus, minted in Rome.

Leo entered Constantinople on 25 March 717 and forced the abdication of Theodosios III, becoming emperor as Leo III.

Lequien cites twenty-nine bishops from the fourth to the 18th centuries ; the most famous is Jermias II, who occupied the Patriarch of the West until 733, when the Emperor Leo III the Isaurian annexed it to the Patriarchate of Constantinople.

His defiance of the Byzantine emperor Leo III the Isaurian as a result of the iconoclastic controversy in the Eastern Empire prepared the way for a long series of revolts, schisms and civil wars that eventually led to the establishment of the temporal power of the popes.

The Italian revolt of the 720s, organized and led by Pope Gregory II, was originally provoked by the attempt of the Constantinople Emperor Leo III the Isaurian to introduce a poll tax in the Italian provinces of the Byzantine Empire in 722, and set in motion the permanent separation of Italy from the Byzantine empire.

He had his fleet concentrate on Rhodes with orders not only to resist the approach of the enemy, but to destroy their naval stores, and dispatched an army under Leo the Isaurian, afterwards emperor, to invade Syria.

Leo III the Isaurian issued a new code, the Ecloga, in the early 8th century.

According to George Cedrenus, the volcano erupted in the summer of 727, the tenth year of the reign of Leo III the Isaurian.

* 726: Byzantine Emperor Leo III the Isaurian destroys the icon of Christ above the Chalke Gate in the capital city of Constantinople, beginning the first phase of the Byzantine Iconoclasm.

* Tarasicodissa, Isaurian officer of the Excubitors ( Imperial Guard ), comes with evidence that Ardabur ( magister militum ) is forming a conspiracy against Leo I. Ardabur is arrested for treason.

* August 15 – Byzantine Emperor Leo III the Isaurian and Khan Tervel of Bulgaria force the troops of the Umayyad Caliphate to abandon the Second Arab Siege of Constantinople ( 717 – 718 ), preventing a major Arab incursion into the Byzantine Empire.

* March 25 – Leo III the Isaurian usurps the throne of Byzantium.

* The Byzantine emperor Leo III the Isaurian orders the execution of the ex-emperor Anastasius II.

* Leo III the Isaurian withdraws the Balkans, Sicily and Calabria from the jurisdiction of the pope, in response to Gregory III's support of a revolt in Italy against iconoclasm.

* Former Byzantine emperor Anastasios II leads a revolt against emperor Leo III the Isaurian.

* Orso Ipato is elected Doge of Venice and appointed Roman consul by Emperor Leo III the Isaurian.

* Leo III the Isaurian bans the worship of religious images, beginning the iconoclastic controversies.

* The Battle of Ravenna is fought between the troops of Byzantine Emperor Leo III the Isaurian, and a force of Italians, raised by Pope Gregory II in defence of image worship, which Leo had outlawed.

However, as the previous 30 years since the approval of icon-veneration at the Synod of 787 had represented for the Byzantines a string of military catastrophes, Leo resolved to reach back to the policies of the more successful Isaurian dynasty.

It had destroyed what were the two former foremost military powers, the Sassanid Empire, which it absorbed completely, and the greater part of the Byzantine Empire, including Syria, Armenia and North Africa, although Leo the Isaurian stemmed the tide when he defeated the Umayyads at the Battle of Akroinon ( 739 ), their final campaign in Anatolia.

The most known are: Ecloga ( 740 )— enacted by emperor Leo the Isaurian, Proheiron ( c. 879 )— enacted by emperor Basil the Macedonian and Basilika ( late 9th century )— started by Basil the Macedonian and finished by his son Leo the Wise.