Who was the last man to rule the whole Roman Empire and the first to proclaim Christianity as its official religion?

Question

Quizplus · Accepted Answer

Theodosius was the last man to rule the whole Roman Empire and he also proclaimed Christianity as its official religion in 380 AD with the Edict of Thessalonica. Jovian only ruled for a short period of time and did not have a significant impact on the religion of the empire. Constantine was the first emperor to convert to Christianity, but he did not make it the official religion of the empire. Diocletian and Decius were both infamous for their persecution of Christians, so they cannot be the answer.

Who Was the Last Man to Rule the Whole Roman