Hosius of Corduba (c. 256–359), also known as Hosius the Confessor, Osius or Ossius, was a bishop of Corduba (now Córdoba, Spain) and an important and prominent advocate for homoousion Christianity during the period when the Arian controversy divided early Christianity.
He probably presided at the First Council of Nicaea and also presided at the Council of Serdica.
After Lactantius, he was the closest Christian advisor to Emperor Constantine the Great and guided the content of public utterances, such as Constantine's Oration to the Saints, addressed to the assembled bishops.
He is venerated as a saint in the Eastern Orthodox Church, Roman Catholic Church and Oriental churches, with the title of confessor of the faith, being commemorated with a feast day on 27 August.
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