because they named the planet. And discovered it.
The Romans were Latins.
The Planet Neptune was re-named by the Romans for the Roman Sea God, Neptune, in the tradition of the Greeks.
The Romans called him Neptune.
Cause Neptune is the planet with lots of water of course!
They were important t the upper class ancient Romans because that is were they lived.
To the Romans, the sea was very scary. So they didn't pay that much attention to Neptune.
The Romans named their days of the week after their gods and celestial bodies visible to the naked eye. Uranus, Neptune, and Pluto were not discovered until modern times with the aid of telescopes, so they were not known in Roman times.
They aren't.
The Romans called him Neptune.
Poseidon's Roman name is Neptune.
Neptune was the ROMAN god to which the ROMAN people identified with the GREEK sea god, Poseidon.
The Roman god of the sea was Neptunus (Neptune).