The chalkous (plural: chalkoi) was and ancient Greek bronze coin denomination. In Pollux (4,175; 9,65f. 81) generally described as a bronze coin, the chalkous was the smallest fraction of a coin in Greek poleis. In Athens one obolos makes 8 chalkoi, in Delphi and Epidaurus 12 chalkoi, in Priene 16 chalkoi. The weight of the chalkos varied; the bronze coins from Seleucia/Tigris having an × (= Chalkos) under Antiochus IV weigh c. 2.8-5 g. A Neronian coin with a value marking in Antiochia Orontes weighs c. 2.5 g.