(Ἐπιθέρσης), of Nicaea, a grammarian, who wrote on Attic comic and tragic words (περὶ Λέξεων Ἀττικῶν καί Κωμικῶν καὶ Τραγικῶν ; Steph. Byz. s. v. Νίκαια; Erotian. s. v. Ἄμβην, p. 88, who gives the name wrongly Θέρσις). If he be the same as the father of the rhotorician Aemilianus, he nust have lived under the Emperor Tiberius. (Plut. de Def. Orac. p. 419b.)
[P.S]A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890