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Penthilus is the name for two distinct people in Greek mythology.
Son of Orestes and Erigone 
Penthilus (Πένθιλος) was the illegitimate son of half-siblings Orestes and Erigone. Erigone was the daughter of Clytemnestra and Aigisthos (both of whom Orestes killed), while Orestes was the son of Clytemnestra and Agamemnon. Erigone is said to have hanged herself. Orestes was ruler over much of the Peloponnese and died of a snakebite at age 70. One story says that as a child, Penthilus was torn apart and devoured by wolves in the Taygetus mountains, near Sparta. His father established a festival of mourning, the so-called Penthilia in his honour.
King of Messenia 
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