Charlemagne and the Byzantine Emperors ruled countries with the same name, Empire of the Roman People. Since the Byzantines got the name first, they were a bit upset when Charlemagne took it.
Please see the related question below for more information.
Justinian I
The two emperors who tried to restore order in the Roman Empire were Diocletian and Constantine I (or the Great).
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It was to expensive to restore the old Roman Empire
Frescoes were less widespread in the Byzantine period than in the classical period. They were often replaced by wall mosaics.
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Byzantium
Constantinople was the capital of the Byzantine Empire, which had a long line of emperors from its founding in 330 AD until the fall of the city in 1453. There were a total of 88 Byzantine emperors, including co-emperors. The city was also the capital of the Eastern Roman Empire, which is often considered synonymous with the Byzantine Empire.
Byzantine art was paid for mostly by emperors and the Orthodox church.
Both emperors improved the Byzantine legal system by organizing laws more clearly.
they both had governed emperors
Justinian I
Diocletian
The Emperors Justinian and Basil II
Yes.
It varied. The Byzantine emperors reigned for life. Some of the emperors reigned for along time, while others died shorty after their accession to power. The length of the reign of emperors also depended on the political stability of he empire. The empire went thought periods of instability which was usurper emperors and/or civil wars. In such periods power changed hands quickly.
The two emperors who tried to restore order in the Roman Empire were Diocletian and Constantine I (or the Great).