Marcellus, 2511 bishop of Ancyra, flourished in the reign of Constantinus and Constantius and wrote many volumes of various Propositions and especially against the Arians. Works of Asterius and Apollinarius against him are current, which accuse him of Sabellianism. Hilary too, in the seventh book of his work Against the Arians, mentions him as a heretic, but he defends himself against the charge through the fact that Julius and Athanasius bishops of Rome and Alexandria communed with him.