Antiochus III, also known as Antiochus the Great, was a Hellenistic king of the Seleucid Empire who reigned from 222 to 187 BC. He was known for his military campaigns and efforts to expand the empire's territory. Antiochus the Great is remembered for his conflicts with the Ptolemaic Kingdom of Egypt and his attempts to assert Seleucid power in the eastern Mediterranean region. His reign was marked by both military successes and setbacks, and he played a significant role in the power struggles of the Hellenistic world during his time.