Answer
In the Battle of Magnesia, fought in 190 BC near Magnesia ad Sipylum in present-day Turkey, the Seleucid Empire led by Antiochus III was decisively defeated by the Roman Republic under the command of Lucius Cornelius Scipio Asiaticus. This pivotal battle marked a turning point in the Roman–Seleucid War, solidifying Rome's dominance over Greece and Asia Minor, and significantly weakening the Seleucid Empire.