Zeus was the most important Greek god. He Roman counterpart was Jupiter/Jove.
I know one that isn't. Janus. Roman God of Doorways
Mercury was one of the Roman Gods. He was the messanger god.
He is one of the begin 4 gods in greek mythology. In Roman he is called Cupid.
Apollo. He was one of the few gods with the same name in Greek and Roman.
Apollon/Apollo is one of the Olympic gods in Greek/Roman mythology.
Janus is a Roman god, and not minor to the minds of ancient Romans.
We seriously hope you're joking. No one still believed in the Greek or Roman gods by the time the telescope was invented.
They exist in greek and roman mythology as beings with one mortal and one immortal parent.
Mercury was the real name of the god Mercury and it was never changed. He was a Roman god. At one point of their history the Romans associated their gods to the Greek gods. The Greek equivalent of Mercury was Hermes.
Ares is one of the 12 Olympian (Greek) gods. His Roman equivalent is Mars.
He was niether. Osiris was one of the oldest Egyptian gods. He symbolized death and rebirth.
Apollo is the Greek and Roman God of the sun, music, prophesy, and medicine. He is one of the few gods whose name is the same in both Greek and Roman Mythologies.