Answer:
if were talking about religion... then..
Religio Romana
The Religio Romana (literally, the "Roman Religion") constituted the major religion of the city in antiquity. The first gods held sacred by the Romans were Jupiter, the highest, and Mars, the god of war, and father of Rome's twin founders, Romulus and Remus, according to tradition.
Over time, the Christian church and faith grew more organized. In 313 AD, the Emperor Constantine issued the Edict of Milan, which accepted Christianity: 10 years later, it had become the official religion of the Roman Empire.