LEUCO´NIUM(Λευκώνιον).
1. A place mentioned in the Antonine Itinerary (p. 260) in the south of Pannonia, on the road from Aemona to Sirmium, 82 Roman miles to the north-west of the latter town. Its site is pointed out in the neighbourhood of the village of Rasboistje.
2. A town of Ionia, of uncertain site, where a battle was fought by the Athenians in B.C. 413. (Thucyd. 8.24.) From this passage it seems clear that the place cannot be looked for on the mainland of Asia Minor, but that it must have been situated near Phanae, in the island of Chios, where a place of the name of Leuconiais said to exist to this day. Polyaenus (Polyaen. 8.66) mentions a place, Leuconia, about the possession of which the Chians were involved in a war with Erythrae; and this Leuconia, which, according to Plutarch ( de Virt. Mul. 7. p. 7, ed. Reiske), was a colony of Chios, was probably situated on the coast of Asia Minor, and may possibly be identical with Leucae on the Hermaean gulf. [Comp. LEUCAE] [L.S]