Theodosius I was the emperor who spread Christianity. He was the emperor who made it mandatory for everyone under his rule to be a Christian. This happened in 380 AD. Up to this time other religions were tolerated.
The ideas of Christianity were seen by many as a threat to the Roman Empire. Some believe that is why Rome eventually embraced Christianity, as to influence it.
Constantine
Which Roman leader exactly? Whom are your referring to?
You must be thinking of Constantine the Great. However, whether he actually converted to Christianity is a matter of debate. He did make Christianity a legal religion.
If you mean the ancient city of Rome, it has always been the Bishop of Rome, (the title of Pope was added later). In the Roman days he was the leader of what was called Latin or Western Christianity (now it is called Catholic Christianity). If you are referring to the Roman Empire, there were five leaders of Christianity, the patriarchs. One of them was the Bishop of Rome. The others were the patriarchs of what was then called Greek or Eastern Christianity (now it is called Orthodox Christianity). They were the patriarchs of Constantinople, Antioch, Jerusalem and Alexandria.
The ideas of Christianity were seen by many as a threat to the Roman Empire. Some believe that is why Rome eventually embraced Christianity, as to influence it.
Constantine
Which Roman leader exactly? Whom are your referring to?
You really need to narrow your question down a bit. A lot of Jews embraced Christianity, and, over the next several centuries, a lot of pagans embraced Christianity.
The pastor. ---- The Pope, With most of the Christians in the world being Roman Catholics, The Roman Catholic Church is the face of Christianity to the non-Christian world, as such, the Pope is the most major religious leader in Christianity.
No that's Constantine
Most historians of this era agree Christianity was established as the official religion of Rome by the Roman Emperor Constantine in 313 AD.
Paul the Apostle.
You must be thinking of Constantine the Great. However, whether he actually converted to Christianity is a matter of debate. He did make Christianity a legal religion.
If you mean the ancient city of Rome, it has always been the Bishop of Rome, (the title of Pope was added later). In the Roman days he was the leader of what was called Latin or Western Christianity (now it is called Catholic Christianity). If you are referring to the Roman Empire, there were five leaders of Christianity, the patriarchs. One of them was the Bishop of Rome. The others were the patriarchs of what was then called Greek or Eastern Christianity (now it is called Orthodox Christianity). They were the patriarchs of Constantinople, Antioch, Jerusalem and Alexandria.
There are several types of Christianity, and there are a number of different leaders. The branch of Christianity with the largest membership is the Roman Catholic Church, which is currently lead by His Holiness, Pope Benedict XVI.
Several sects of the Christian church, but not all Christians, acknowledge a "Pop":Catholic Church - PopeEastern Orthodox Churches - Pope and Patriarch of AlexandriaOriental Orthodox Churches - Pope of Alexandria