Passage 8.45.3
Ἡρακλειδῶν δὲ ἐς Πελοπόννησον κατιόντων Ἔχεμος ὁ Ἀερόπου Τεγεάτης ἐμονομάχησεν ἰδίᾳ πρὸς Ὕλλον, καὶ ἐκράτησε τοῦ Ὕλλου τῇ μάχῃ. Λακεδαιμονίους τε οἱ Τεγεᾶται πρῶτοι Ἀρκάδων σφίσιν ἐπιστρατεύσαντας ἐνίκησαν καὶ αἰχμαλώτους αἱροῦσιν αὐτῶν τοὺς πολλούς.
When the Heracleidae were descending into the Peloponnese, Echemos, son of Aeropos, a Tegean, engaged in single combat individually against Hyllus, and defeated Hyllus in the battle. The Tegeans also were the first of the Arcadians to defeat the Lacedaemonians who had attacked them, capturing many of them as prisoners.