A Dictionary of Greek and Roman biography and mythology

(Νύψιος), a native of Neapolis, and a brave and skilful officer, who was sent by the younger Dionysius to the relief of the citadel at Syracuse, which was besieged by the Syracusans under Dion. He arrived just in time to prevent the garrison from surrendering the citadel, and, by a sudden sally in the night, defeated the Syracusans with great slaughter; but the next day, Dion having returned to the city, Nypsius was defeated in his turn, and once more shut up within the citadel. (Diod. 16.18_20; Plut. Dion. 41-4G.)

[E.H.B]