Hosius of Corduba (c. 256 – 359), also known as Osius or Ossius, was a bishop of Cordova and an important and prominent advocate for CatholicChristianity in the Arian controversy which divided the 4th century early Christian Church. He suggested, and possibly presided at the Council of Nicaea and also presided at the Council of Sardica. After Lactantius, he was the closest Christian advisor to the Emperor Constantine and guided the content of public utterances, such as Constantine's Oration to the Saints, addressed to the assembled bishops.