* 681 – Bulgaria is founded as a Khanate on the south bank of the Danube after defeating the Byzantine armies of Emperor Constantine IV south of the Danube delta.

* 527 – Byzantine Emperor Justin I names his nephew Justinian I as co-ruler and successor to the throne.

* 1091 – Battle of Levounion: The Pechenegs are defeated by Byzantine Emperor Alexius I.

* 1018 – Byzantine general Eustathios Daphnomeles blinds and captures Ibatzes of Bulgaria by a ruse, thereby ending Bulgarian resistance against Emperor Basil II's conquest of Bulgaria.

* Alexander, Byzantine Emperor ( 912 – 913 )

* Alexander ( emperor ), Byzantine Emperor ( 912 – 913 )

Alexios II Komnenos or Alexius II Comnenus () ( 10 September 1169 – 24 September 1183, Constantinople ), Byzantine emperor ( 1180 – 1183 ), was the son of Emperor Manuel I Komnenos and Maria, daughter of Raymond, prince of Antioch.

Alexios III Angelos () ( c. 1153 – 1211 ) was Byzantine Emperor from 1195 to 1203.

Alexios V Doukas, surnamed Mourtzouphlos (, d. December 1205, Constantinople ) was Byzantine Emperor ( 5 February – 12 April 1204 ) during the second and final siege of Constantinople by the participants of the Fourth Crusade.

He was the last Byzantine Emperor to reign in Constantinople before the establishment of the Latin Empire, which controlled the city for the next 57 years, until it was recovered by the Nicaean Emperor Michael VIII Palaiologos.

* Anastasius I ( emperor ) ( 430 – 518 ), Roman ( Byzantine ) Emperor from 491 to 518

In spite of several not insignificant reverses at the hands of Bulgarians, Serbians, and Ottomans, the Emperor had provided the Empire with active leadership, had cooperated with able administrators, and had come closer than any of his predecessors in re-establishing Byzantine control over the Greek peninsula.

Andronikos I Komnenos ( or Andronicus I Comnenus, ; c. 1118 – September 12, 1185 ) was Byzantine Emperor from 1183 to 1185 ).

However, as Andronikos ' rule went on, the Emperor became increasingly paranoid and violent – in September 1185, Andronikos ordered the execution of all prisoners, exiles and their families for collusion with the invaders – and the Byzantine Empire descended into a terror state.

* 475 – Byzantine Emperor Basiliscus issues a circular letter ( Enkyklikon ) to the bishops of his empire, supporting the Monophysite christological position.

Arcadius (; ; 377 / 378 – 1 May 408 ) was the Byzantine Emperor from 395 until his death in 408.

This could be either the normal military dress, with a tunic to about the knees, armour breastplate and pteruges, but also often the specific dress of the bodyguard of the Byzantine Emperor, with a long tunic and the loros, a long gold and jewelled pallium restricted to the Imperial family and their closest guards.

* 491 – Flavius Anastasius becomes Byzantine Emperor, with the name of Anastasius I.

According to the work De Administrando Imperio written by the 10th-century Byzantine Emperor Constantine VII, the Croats had arrived in what is today Croatia in the early 7th century, however that claim is disputed and competing hypotheses date the event between the 6th and the 9th centuries.

In the sixth century, the Byzantine Emperor Justinian oversaw the consolidation of Roman civil law.

At the Istanbul Archaeological Museum a marble plate contains a law by the Byzantine Emperor Anastasius I ( 491-518 AD ), that regulated fees for passage through the customs office of the Dardanelles ( see image to the right ).

* 1025 – Basil II, Byzantine Emperor ( b. 958 )

* 627 – Battle of Nineveh: A Byzantine army under Emperor Heraclius defeats Emperor Khosrau II's Persian forces, commanded by General Rhahzadh.

After his return to Jerusalem in 1167, Amalric married Maria Comnena, a great-grandniece of Byzantine emperor Manuel I Comnenus.

On the urgings of the Byzantine emperor Manuel II Palaeologus a new crusade was organized to defeat him.

The Byzantine Empire under Manuel I Komnenos | Manuel I, c. 1180

In eastern Europe, the French army was at times hindered by Manuel I Comnenus, the Byzantine Emperor, who feared that it would jeopardize the tenuous safety of his empire ; however, during their 3-week stay at Constantinople, Louis was fêted and Eleanor was much admired.

Byzantine Emperor Manuel I Comnenus, who became a close ally of the Kingdom of Jerusalem.

Nur ad-Din remained a threat in the east, and Baldwin had to contend with the advances of Byzantine emperor Manuel I Comnenus, who claimed suzerainty over the Principality of Antioch.

In order to bolster the defences of the kingdom against the growing strength of the Muslims, Baldwin III made the first direct alliance with the Byzantine Empire, by marrying Theodora Comnena, a niece of emperor Manuel ; Manuel married Baldwin's cousin Maria.

It seemed likely that Antioch itself would fall to Nur ad-Din, but he withdrew when Emperor Manuel sent a large Byzantine force to the area.

That year, Manuel sent a large Byzantine fleet of some 300 ships to assist Amalric, and the town of Damietta was placed under siege.

Jerusalem looked again towards the Byzantine Empire for help, and Emperor Manuel was looking for a way to restore his empire's prestige after his defeat at the Battle of Myriokephalon in 1176 ; this mission was undertaken by Raynald of Châtillon.

* 1118 – Manuel I Komnenos, Greek Byzantine Emperor ( d. 1180 )

In 1155, Byzantine Emperor Manuel Comnenus invaded the Italian peninsula from the south, landing his forces in the region of Apulia.

In 1419 – 1420 Martin had diplomatic contacts with the Byzantine emperor Manuel II, who was invoking a council in Constantinople as a move to reduce the pressure from the Ottoman Turks.

In 1398 and 1399, Boniface IX appealed to Christian Europe in favor of the Byzantine emperor Manuel II Palaeologus, threatened at Constantinople by Sultan Bayezid I, but there was little enthusiasm for a new crusade at such a time.

* 1153-The First Treaty of Constance is signed between Emperor Frederick I and Pope Eugene III, by the terms of which, the emperor is to prevent any action by Manuel I Comnenus to reestablish the Byzantine Empire on Italian soil and to assist the pope against his enemies in revolt in Rome.

* Belgrade is rebuilt by Byzantine emperor Manuel I Comnenus.

* April 5 – Manuel I Comnenus becomes Byzantine Emperor.

* Manuel I Comnenus brings Raymond, Prince of Antioch, under Byzantine influence.

* November 28 – Manuel I Comnenus, Byzantine Emperor ( d. 1180 )

* November 28 – Manuel I Comnenus, Byzantine Emperor ( d. 1180 )

* December – Manuel II Palaiologos becomes the first ( and last ) Byzantine Emperor to visit England.