одетый в пурпур

From LSJ

μηδενί δίκην δικάσῃς πρίν ἀμφοῖν μῦθον ἀκούσῃς → do not give your judgement on anything until you have heard a speech on both sides

Source

Russian > Greek

ὁλοπόρφυρος, πορφύρεος, πορφυροῦς