Epilais was one of the daughters of Thespius, King of Thespiae, Boeotia. She was one of the forty-nine of Thespius' fifty daughters to sleep with Heracles while he was in Thespia. She would bare Astyanax.
Spouse & Lovers
Herakles (lover for one night)
by Epilais he [Herakles] had Astyanax - Apollod. Biblioteca 2.7.8