Theodosius of Antioch was a prominent Christian bishop in the early 5th century, known for his leadership in the city of Antioch. He played a significant role in the development of early Christian doctrine and was involved in various theological debates of his time. His tenure as bishop was marked by efforts to unify the Christian community amidst growing divisions. Theodosius is often remembered for his opposition to Arianism, a belief that challenged the nature of Christ's divinity. His commitment to orthodox Christianity helped shape the beliefs of the Eastern Orthodox Church and contributed to the broader Christian theological landscape during a pivotal period in history.