In the Roman–Seleucid War, Cieriumwas taken by the army of Antiochus III the Great, together with Metropolis and adjacent fortresses. Shortly thereafter Roman consul Manius Acilius Glabrio, in his advance through Thessalian territory, received delegates from the cities of Metropolis and Cierium that again, as in the Second Macedonian War, offered to surrender their cities shortly before the Battle of Thermopylae (191 BC).