The head of the fish is the first part to smell. Ἰχθὺς ἐκ τῆς κεφαλῆς ὄζειν ἄρχεται: ἐπὶ τῶν ἐπιστάτας φαύλους ἐχόντων "The head of a fish begins to stink first." Used of bad rulers, whose contagion poisons the rest of the people. The expression seems to derive from the…