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Constantine the Great (280–337) was born and raised in Naissus( today's City of Niš). He erected a majestic residence in one of the luxurious suburbs of ancient Naissus, where he often resided and attended to state affairs.
Constantine was the son of Flavius Valerius Constantius, a Roman army officer, and his consort Helena. His father became Caesar, the deputy emperor in the west in 293 AD. Constantine was sent east, where he rose through the ranks to become a military tribune under the emperors Diocletian and Galerius. In 305, Constantius was raised to the rank of Augustus, senior western emperor, and Constantine was recalled west to campaign under his father in Britannia. Acclaimed as emperor by the army at Eboracum (Modern-day York) after his father's death in 306 AD, Constantine emerged victorious in a series of civil wars against the emperors Maxentius and Licinius to become sole ruler of both west and east by 324 AD.
Constantine played an influential role in the proclamation of the Edict of Milan in 313, which decreed tolerance for Christianity in the empire.
The age of Constantine marked a distinct epoch in the history of the Roman Empire.He built a new imperial residence at Byzantium and renamed the city Constantinople after himself (the laudatory epithet of "New Rome" came later, and was never an official title). It would later become the capital of the Empire for over one thousand years; for which reason the later Eastern Empire would come to be known as the Byzantine Empire.
info source: https://en.wikipedia.org/wiki/Constantine_the_Great
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