Apparently Darius the Mede is only known from the Book of Daniel. Non-Persians had a tendency to mix up Medes and Persians (at least the Greeks often say "the Medes" when they mean Persians). Hence the old proverb: one man's Mede is another man's Persian.
LOL, LOL & LOL
Hence the old proverb: one man's Mede is another man's Persian.[virtual ticker tape parade for VR]