Answer
Antiochus III, also known as the Great, the ruler of the Seleucid Empire, met his demise in 187 BCE, during a failed military campaign against the Elymais, an ancient region near Persia, present-day Khuzestan. His attempt to plunder their temple led to a fierce counterattack, resulting in his tragic end. Antiochus' reign was marked by numerous conflicts, including the Roman–Syrian War, which significantly weakened his empire.