4th century AD

The 4th century AD (around 300-399 AD) was a period of significant transition in the Roman Empire and early Christianity. It saw the empire's decline in the West, with barbarian invasions and internal struggles, while the East thrived under the Byzantine Empire. Christianity grew from a persecuted faith to the empire’s official religion under Emperor Constantine, who also established Constantinople as a new capital. This era witnessed important religious and political changes, shaping the future of Europe and the Christian church, laying groundwork for medieval civilization.