Starting in the 4th Century, with Constantine, the answer is Christianity. Before that, Rome was mostly pagan.
Christianity
it is christianity
Constantine, who made Christianity the state religion of the Roman Empire in 325 AD
He changed it from a persecuted religion into an officially tolerated religion.
APEX: Science and technology flourished in Islamic caliphates but declined in Western Europe.
Timbuktu was the major center for Sub-Saharan trade.
a protsetant rebellion in Spain
Christianity was the major religion that was born during a time when the Roman Empire was near its height.
Christianity was the major religion that was born during a time when the Roman Empire was near its height.
Hinduism was a major religion during the Mauryan Empire and has continued to be a major religion in India since then.
Hinduism was first born in India. Thus many of the Indian people are Hindu.
The religion in the Byzantine Empire was Christianity. This was the furthest extent of Christianity to the East. Further East were Islam and other major religions during this time. Christianity became the main religion because of Justinian's influence on the people.
The Seljuk Empire adopted Sunni Islam as its major religion. They embraced Sunni beliefs and established Islamic institutions in their territories, promoting Islam as the dominant religion in the region.
Roman Catholicism
during the Roman Empire, constantine, who was the emperor of the empire, had a major impact on Christianity because he was christian. religion is always associated with the social world. as for the hierarchy bishops, priests, ministers, apostles all were important and then came the military or the common peoples
A great many things happened over the more than 500 years of the history of this empire.
By the late 3rd century AD Christianity had become the major religion of the Roman Empire. Prior to this, the Roman religion was the most important one because it was the state religion. However, peoples in the provinces retained their old religions they had worshiped since before the Roman conquests.
To reunite the Roman Empire.
Buddhsm was introduced during the Han dynasty