High Quality Content by WIKIPEDIA articles! The Battle of Thermopylae was fought in 191 BC between a Roman army led by consul Manius Acilius Glabrio and a Seleucid force led by King Antiochus III the Great. The Romans were victorious, and as a result, Antiochus was forced to flee Greece. It was described by Appian (included below) and by Livy at 36.16-19.