Gregory of Elvira was a fourth-century bishop of Elvira in the Roman province of Baetica. A dedicated theologian and presbyter, he is recognized as a staunch defender of the Nicene creed against Arianism. Following the death of Lucifer of Calaris, Gregory emerged as a leader of the Luciferian movement, which maintained that communion with any clergy previously associated with Arianism was unlawful. His theological convictions and leadership during this period of doctrinal conflict established his legacy within the early Christian church.