King Antiochus I was a ruler of the Seleucid Empire, reigning from 281 to 261 BCE. He was the son of Seleucus I Nicator, the founder of the empire, and he worked to consolidate and expand his father's territories. Antiochus I is known for his efforts in promoting Hellenistic culture and establishing cities, including the city of Antioch, which became a major center of trade and culture. During his reign, Antiochus I faced challenges from rival kingdoms and internal strife. He is remembered for his military campaigns against the Ptolemaic Kingdom in Egypt and for maintaining relative stability in the empire. His rule contributed to the spread of Greek culture across the regions he governed.