Roman mythology of the olden times is composed of myths of gods and humans. Romans had many gods whom they worshiped. It is believed that they lived in fear of these gods.
A legend says that Romulus and Remus were standing on two hills. A circle of birds hovered over Romulus, indicating him to be the king of Rome. Romulus created the Roman Legions and the Roman Senate. He populated Rome by the abduction of some women from the Sabine tribes. This resulted in the Roman population being a mixture of the Sabines and the Romans.
If the Romans conquered a new territory, they incorporated the local gods of the new territory into their mythology. Cybele, a Phrygian goddess who symbolized Mother Earth, was worshiped in Anatolia since the Neolithic times. In 203 BC, Romans included her in their goddesses.
The ancient Romans believed that every household had a guardian god, called Lars. These guardian spirits were believed to stay with the family and influence their life. At the peak of the imperial system, emperor worship began to be practiced. This continued till the 4th century AD, until the Western Emperor Constantine removed emperor deification from Rome.
Greek and Etruscan mythologies have influenced the Roman religion. With the emergence of Christianity, Roman religion faded to a certain extent. Yet, modern-day traditions hold glimpses of the original Roman culture. Influences of different belief systems on the Romans have also influenced their mythology.