Melanthius in Harpers Dictionary of Classical Antiquities
A goat-herd of Odysseus.
An Athenian tragic poet attacked by Aristophanes ( Pax, 796, and elsewhere).
A Greek painter of the Sicyonian School, contemporary with Apelles (B.C. 332), with whom he studied under Pamphilus (Pliny , Pliny H. N. xxxv. 50).
Melanthius in Wikipedia
Melanthius (Μελάνθιος) was a notable ancient Greek painter of the 4th century BC. He belonged to the school of Sicyon, which was noted for fine drawing.