Eusebius of Rome was a 4th-century presbyter and Roman patrician who lived and died in Rome around 357. He is remembered for his staunch defense of the Nicene Creed during a period of intense theological conflict. According to certain historical accounts, he publicly challenged the orthodoxy of both the emperor Constantius II and Pope Liberius. He is venerated as a saint in the Catholic, Anglican, and Orthodox traditions, with his feast day observed on 14 August.