Definition
Theodosius I, also known as Theodosius the Great (347–395 AD), was Roman Emperor from 379 to 395 AD. He is renowned for making Nicene Christianity the state religion of the Roman Empire in 380 AD. His actions significantly suppressed paganism and influenced the development of Christian doctrine. Think of him as a pivotal figure in the transition from the Roman Empire's classical roots to its Christianized future. His decrees and policies reshaped the religious landscape of Europe.