The Roman is Nereus; the Greek is Νηρευς
Pegasus is both Greek and Roman.
Apollo is Greek god not Roman.
Persephone (Greek) Proserpine/Proserpina (Roman)Pan (Greek)Poseidon (Greek)Pluto (Roman)
Saturn is a Roman god not greek
The Romans adopted Greek medicine, their siege engines and their catapults (balistas). Latin literature was inspired by the epics, tragedies and comedies of the Greeks. The educators of the elites were Greek and Roman education was both in Latin and Greek. Roman elite men were fluent in Greek Roman elite boys learned Greek rhetoric. Two schools of Greek philosophy (stoicism and epicureanism) became popular. Some young men went to Greece to learn Greek rhetoric and/or philosophy. Greek sculptors were hired to make fine statues.
If You are talking about greek an roman gods, it is roman.
The Roman is Nereus; the Greek is Νηρευς
Hephaestus is a Greek god not Roman.
Apollo is Greek god not Roman.
Pegasus is both Greek and Roman.
It is a Greek myth if written by a Greek in Greek, or stated to be originating with the ancient Greek people. It is a Roman myth if written in Latin by a Roman citizen.
learn in Greek is μαθαίνω [matheno]
Persephone (Greek) Proserpine/Proserpina (Roman)Pan (Greek)Poseidon (Greek)Pluto (Roman)
Zeus was Greek. Jupiter was Roman.
Roman. Venus's Greek counterpart is Aphrodite.
Saturn is a Roman god not greek