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
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
Diocletian
Justinian I
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.
In the Orthodox the emperor claims authority over all religious leaders. And in the Roman Catholic the pope claims authority over all kings and emperors.
Yes and No. Comparing Byzantine emperors with Charlemagne in the time of 800 to 814 is comparing them with the one person who was probably the most powerful monarch of the Middle Ages. Later Byzantine emperors would have to be compared with western emperors of the Holy Roman Empire of their own times. Most of the emperors of the Holy Roman Empire were rather weak. This was partly because they were elected, and so there was no father to prepare the throne for them, but it was mostly because they had powerful feudal vassals, including kings, who limited their authority. Of course the Byzantine Empire gradually declined through the entire Middle Ages, leaving a rather decrepit country in the end, and an emperor of this country had no more power than his country did, and the Holy Roman Emperor had much more power than the Byzantine Emperor.