Antiochus I was a king of the Seleucid Empire, ruling from 281 to 261 BCE. He was the son of Seleucus I Nicator, the founder of the empire, and Stratonice, the daughter of Demetrius Poliorcetes. Antiochus I is known for his efforts to consolidate and expand the empire, as well as for promoting Hellenistic culture throughout his territories. During his reign, Antiochus I faced challenges, including conflicts with neighboring kingdoms and internal strife. He is also recognized for his building projects, including the city of Antioch, which became a major cultural and economic center. His reign marked a significant period in the history of the Seleucid Empire.