Antiochus III the Great was a ruler of the Seleucid Empire from 222 to 187 BCE. He is known for expanding his kingdom significantly, reaching its greatest territorial extent. Antiochus III engaged in numerous military campaigns, including conflicts with the Ptolemaic Kingdom of Egypt, which helped to strengthen his power in the region. His reign was marked by efforts to consolidate his empire and improve its administration. Antiochus III also promoted trade and cultural exchanges, fostering a blend of Greek and Eastern influences. Despite his successes, he faced challenges, including revolts and the eventual rise of the Roman Republic as a dominant power.