This is the third volume in the series of commentaries on Early Greek Epic Fragments (EGEF III). It contains introduction, text, translation, and commentary on the Herakleia by Panyassis of Halikarnassos and on the Theseis. Two other volumes have been already published (EGEF I: Genealogical and Antiquarian Epic, De Gruyter 2017; EGEF II: Epics on Herakles: Kreophylos and Peisandros, De Gruyter 2022) and one more is to follow (EGEF IV: The Persika by Choerilos of Samos). This sub-series within TCSV aims to provide scholars and students with up-to-date commentaries on the extant fragments of early Greek epic that have not received, contrary to Cyclic epic, the attention they deserve.