Larissaeus

and LARISSAEA (Λαρισσαῖος and Λαρισσαῖα), surnames of Zeus and Apollo, derived from the arx Larissa at Argos (Paus. 2.24.4; Strab. ix. p.440, 14.649; Steph. Byz. s. v. Λάρισσα), and of Athena, who derived it from the river Larissus, between Elis and Achaia, where the goddess had a sanctuary. (Paus. 7.17.3.) [L.S]

An epithet applied by Vergil (Aen. ii. 197, xi. 404) to Achilles, either with reference to the town of Larissa Cremasté, which lay within his dominions (see Larissa), or as equivalent generally to Thessalicus.