Manius Acilius Glabrio
In 192 BC, war broke out between Rome and the Seleucid ruler Antiochus III. Antiochus invaded Greece with a 10,000 man army, and was elected the commander in chief of the Aetolians. Some Greek cities now thought of Antiochus as their saviour from Roman rule, but Macedon threw its lot in with Rome. In 191 BC, the Romans under Manius Acilius Glabrio routed him at Thermopylae and obliged him to withdraw to Asia. During the course of this war Roman troops moved into Asia for the first time, where they defeated Antiochus again at Magnesia on the Sipylum (190 BC). Greece now lay across Rome's line of communications with the east, and Roman soldiers became a permanent presence. The Peace of Apamaea (188 BC) left Rome in a dominant position throughout Greece.