increases in Gaul, and sought further conquests. http://en.wikipedia.org/wiki/Brennus_(3rd_century_BC ) Battle of Thermopylae (191 BC) 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