In greek mythology the counter part of mercury is hermes
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Mercury was Hermes in Greek mythology. Hermes/Mercury was the
messenger god.
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Mercury is not named after Apollo; it is actually named after
the Roman god of mythology Mercury, who was the messenger of the
gods. In Greek mythology, Mercury was known as Hermes.
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In Roman mythology, the god "Mercury" is equivalent to Hermes in
Greek mythology. He is the god of messengers and travelers. So he
is the messenger of the gods.