In the meantime, the Roman state continued expanding, reaching Carthage, a trading city located at the center of the Mediterranean routes between the east and the west.
The two states have been allied for centuries, so Carthage didn’t feel threatened by Rome. However, for Rome, the alliance was no longer sufficient to maintain peace, causing the outbreak of the Punic War. During the war, the strong fleets and military of Rome managed to overcome the opponent. Carthage was defeated in the battle of Egadi in 241 BC and Sicily became a Roman province. The Roman state annexed Sardinia and Corsica subsequently.
In the centuries to come, Rome did nothing else but continue expansion beyond the borders of the peninsula. With time, the Roman state implemented its hegemony further and evolved into a true Empire. By tradition, Roman emperors were all called Augustus, while their successors were Caesars.
One of the greatest emperors of Rome was Diocletian, who ruled between 284 and 305 AD. Initially a general of modest origins, Diocletian implemented a series of reforms which strengthened his authority and reorganized the state’s administrative, financial, and judicial systems.
In the century before Diocletian, Rome had witnessed internal struggles and usurpations that had disturbed the life of the Empire. As a result, the new political system involved a so-called tetrarchy.
Diocletian named a second Augustus and shared the political power between the east and west. Not only that, but each Augustus had to name a Caesar as a direct successor. This transformed succession into an automatic act free of controversy.
Despite the great system, the tetrarchy didn’t last and Diocletian abdicated in 305. Following was Constantine, who ruled the empire between 306 and 337. Under his rule, Christianity was implemented throughout the Roman territory, becoming one of the greatest religions in history. By the end of the fourth century, Christianity became the official religion of the Roman Empire and pagan worship was banned.
The last great figure of Roman emperor was Theodosius, who ruled between 379 and 395. Theodosius implemented a policy of compromise, allowing many barbarian communities to settle within the confines of the Empire. This permissive policy, together with the division of the Empire in two parts, led to the weakening of the hegemony. Soon after the death of Theodosius, the central power weakened even more due to inefficiency of the successors. As a result, the barbarian invasions didn’t find any obstacles and the fate of the Empire began a descending path.