Saint Christopher (Greek: Ἅγιος Χριστόφορος, Ágios Christóforos) is venerated by several Christian denominations as a martyr killed in the reign of the 3rd-century Roman emperor Decius (reigned 249–251) or alternatively under the emperor Maximinus Daia (reigned 308–313). There appears to be confusion due to the similarity in names "Decius" and "Daia". Churches and monasteries were named after him by the 7th century.