Dictionary of Greek and Roman Biography and Mythology/Abronychus
ABRO'NYCHUS (Ἀβρώνυχος), the son of Lysicles, an Athenian, was stationed at Thermopylae with a vessel to communicate between Leonidas and the fleet at Artomisium. He was subsequently sent as ambassador to Sparta with Themistocles and Aristeides respecting the fortifications of Athens after the Persian war. (Herod. viii. 21 ; Thuc. i. 91.)