The helmet gives it away, this here is either Hermes or Mercurius, the Greek or Roman god of merchants and thieves who was often employed by the other gods as messenger because of his speed as symbolized by the wings. He stands high up on the walls of Castle Biebrich in Wiesbaden and I wonder why they chose to depict him so … mature rather than the young spritely god.
More the merchant, possibly the thief, but not the fast messenger after whom the fastest of all planets and thus quicksilver was named.
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pictures imperfect blog 