Eusebius of Nicomedia was a Christian bishop in the early 4th century, known for his role in the Arian controversy. He supported the teachings of Arius, which denied the full divinity of Jesus Christ, leading to significant theological disputes within the early Christian church. Eusebius was influential in the political and religious landscape of his time, particularly during the reign of Emperor Constantine. He became the bishop of Nicomedia, a city in present-day Turkey, and was involved in the Council of Nicaea in 325 AD. Although he initially opposed the Nicene Creed, which affirmed the divinity of Christ, he later played a role in the church's development and the establishment of orthodoxy.