Cleonicus (gr. Kleonikos) of Naupactus in Aetolia, was taken prisoner by the Achaean admiral in a descent on the Aetolian coast, in the last year of the social war, 217 BC; but, as he was a proxenos of the Achaeans, he was not sold for a slave with the other prisoners, and was ultimately released without ransom. (Polyb. v. 95.) In the same year, and before his release, Philip V. being anxious for peace with the Aetolians, employed him as his agent in sounding them on the subject. (v. 102.) He was perhaps the same person who is mentioned in the speech of Lyciscus, the Acarnanian envoy (ix. 37), as having been sent by the Aetolians, with Chlaeneas, to excite Lacedaemon against Philip, 211 BC.