Passage 4.27.1
τὸ δὲ τῶν Τυνδάρεω παίδων μήνιμα ἐς τοὺς Μεσσηνίους ἤρξατο μὲν πρὸ τῆς ἐν Στενυκλήρῳ μάχης, γενέσθαι δὲ αὐτὸ διʼ αἰτίαν τοιάνδε εἰκάζω. μειράκια ὡραῖα ἐξ Ἀνδανίας, Πάνορμος καὶ Γώνιππος, τά τε ἄλλα οἰκείως εἶχον ἀλλήλοις καὶ κοινὰς ἐπὶ τὰς μάχας ἐξόδους καὶ καταδρομὰς ἐποιοῦντο ἐς τὴν Λακωνικήν.
The anger of the sons of Tyndareus against the Messenians began before the battle at Stenyclarus, and I judge it arose from the following cause. Two handsome youths from Andania, Panormus and Gonippus, were closely attached to one another in all respects and regularly made joint expeditions and raids into Laconian territory.