Romans believed in a hierarchal patheon with Jupiter being the most important deity with 11 other gods forming the main pantheon of 12. Then there were the minor deities and finally the Sabine deities, who had been adopted into the roman belief system from other cultures. Rather than considering them separate deities, the Romans interpreted pagan gods as local manifestations or aspects of their own gods, a cultural trait called the interpretatio Romana. When Constantine the great converts to christianity roman beliefs are increasingly displaced by christianity.

Roman divine magic relies on invoking the names of deities who govern a sphere of influence. In invocations, which generally required precise naming, the Romans sometimes spoke of gods as groups or collectives rather than naming them as individuals.

Hermetic orders retreat into the shadows at the advent of christianity. After the sacking of Rome and the fall of Alexandria they practise their magic increasingly in secret for the next 300 years. The houses of the Order of Hermes become mystery cults only a select few can gain access to through invitation.

Main Deities
Jupiter: The mighty king of the gods. Roman God of the Sky, thunderstorms, lightning, weather and air. Also god of law, order, justice, governance and strength. Most important god of the Romans and usually had the highest divine authority over other gods.
Juno: Queen of the Gods and sister-wife of Jupiter. Goddess of Marriage and Women. Protector and Counsellor of Rome.
Mars: God of War, Spring and Justice. Patron of the Roman Legions and divine father of Romulus and Remus.
Venus: Goddess of Love and consort of Mars. Divine mother of Aeneas, ancestor of the Romans.
Bellona: Goddess of War, Conquest and Peace.
Minerva: Goddess of Wisdom, Divine Counsel, Useful Arts and Crafts. Unlike her Greek counterpart, Athena, she wasn't a war goddess.
Janus: God of Beginnings, Endings, Transition, Doorways and Keys.
Vesta: Goddess of the Home and the Hearth. Patron of Rome.

Minor Deities
Janus
Genius
Mercury
Apollo
Neptune
Orcus
Liber
Tellus
Ceres
Juno
Venus

Sabine Gods
Feronia
Minerva
Novensides
Pales
Salus
Fortuna
Fons
Fides
Ops
Flora
Vediovis
Saturn
Sol
Luna
Vulcan
Summanus
Larunda
Terminus
Quirinus
Vortumnus
Lares
Diana
Lucina