The following deities were those that Rome inherited or borrowed from the Greeks - they were considered di novensides, or newcomers. In effect, per-existing, early Italian deities were assimilated with the Olympian gods of Greece, with these gods of the Roman pantheon as the result.
I should mention that the names in parentheses are the Greek versions of Roman gods and goddesses.
Apollo (Apollo) | God of the arts - poetry and music in particular.
Bacchus (Dionysos) | God of wine and mysteries.
Ceres (Demeter) | Goddess of agriculture and fertility.
Diana (Artemis) | Goddess of the hunt and protector of children.
Juno (Hera) | Goddess of marriage; consort of Jupiter.
Jupiter (Zeus) | God of the sky; ruler of the Roman pantheon.
Mars (Ares) | God of war.
Mercury (Hermes) | God of merchants; messenger of the gods.
Minerva (Athena) | Goddess of wisdom, war, and crafts.
Neptune (Poseidon) | God of the sea and earthquakes.
Venus (Aphrodite) | Goddess of love and beauty.
Vulcan (Hephaistos) | God of smiths and metal-workers .