Миллисент
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So, it seems like the portrait is of Huygens; besides everything else, he was an astronomer and discovered the Orion Nebula. Orion is a legendary hunter from Boeotia. Nephele in Greek mythology is the wife of Athamas or Aphares or Atamas, it doesn't matter; the main thing is that he is the king of Orchomenus in Boeotia or the king of Thessaly.
Does it look like a clue from Tox?