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 
Oh my goodness. He should be young and lithe, surely? Very odd.
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He is relatively high up, so maybe people don’t look at him closely. But Wiesbaden has a relatively old populace, maybe he just kept pace? Or they wanted to stress his connection to merchants more than to messenger. I wouldn’t know.
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Perhaps he retailed fancy hats
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😁
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