In Greek mythology, Pentheus (/ˈpɛnθuːs/ or /ˈpɛnθjuːs/; Greek:Πενθεύς) was a king of Thebes. His father was Echion, the wisest of the Spartoi. His mother was Agave, the daughter of Cadmus, the founder of Thebes, and the goddess Harmonia. His sister was Epeiros.