Antiochus I Soter was a Hellenistic king who ruled the Seleucid Empire from 281 to 261 BCE. He was the son of Seleucus I Nicator, the founder of the empire, and inherited a vast territory that stretched from the eastern Mediterranean to parts of Asia. Antiochus I is known for his efforts to consolidate and expand his father's empire, as well as for promoting Greek culture throughout his realm. During his reign, Antiochus I faced various challenges, including conflicts with neighboring kingdoms and internal strife. He is credited with founding several cities, including Antioch, which became a major cultural and economic center. His reign marked a period of relative stability and prosperity for the Seleucid Empire.