I wouldn't say "joined" I would say that they just got passed down through the centuries. Then, they got mixed with the Roman's gods and goddess.
They were not; they came from two different peoples, and when Romans took over Greece their gods and goddesses were adopted and adapted to the Roman people.
the third roman god was neptune which is the roman version of poseidon. it could have been him or hades who is known as pluto. all of the roman gods are the same as the greek gods they just adapted them as their own. i can name all of the greek gods in roman form just in case the answer in worng.
If You are talking about greek an roman gods, it is roman.
Hera(Greek) Juno(Roman)
Greek and Roman gods are myths
It depends on which Greek/Roman god/goddess.
Ancient Helenism. Wiccans also worship Greek/Roman gods too.
Roman gods were often more focused on practical aspects of life and state affairs, reflecting the Roman emphasis on duty and civic responsibility. While many Roman deities mirrored Greek counterparts, they were often renamed and adapted to fit Roman culture and values. For instance, the Greek god Zeus became Jupiter in Rome, with a greater emphasis on law and order. Additionally, Roman religion incorporated a more structured priesthood and rituals, emphasizing the importance of maintaining the favor of the gods for societal stability.
How they are perceived by the ancient people who worshiped them; the Greek gods as interactive and social, the Roman gods as remote and revered as gods and military.
The Greek and Roman gods drank Ambrosia
Both Greek and Roman gods are the same in essence, but have different aspects. Roman gods were taken from Greek gods, but tend to be more warlike and disciplined. Just like the Greek and Roman cultures, the Roman gods were more warlike, disclipined and honorable. The Greek gods on the other hand, tended to merge into the more artistic creative side. However, the main similarity between Greek and Roman gods is simply this: They are both the gods of whatever they were in the other culture. For example, Hera from Greek myths, is still the goddess of marriage in her Roman aspect, or Juno. Another example is Aphrodite, she is still the goddess of love in her Roman aspect, Venus.
Hades in greek, Pluto in roman.