A. He made it the official religion of the Roman Empire.
Theodosius was critical in light of the fact that when Constantine died in A.D. 337 he turned into the new sovereign, picked up control, and finished the battling. Theodosius I was the 67th Roman Emperor. He was critical in light of the fact that he was the sovereign who made Christianity the official religion of the Roman domain in 380 AD. Also, he requested that all individuals progress toward becoming Christians and prohibited every agnostic god.