Marcellus on Ancyra was a very important and influential Bishop who played a large and influential role in the Fourth Century Arian Crisis. However, he is largely forgotten. His theology is unique and doesn't really fit in any category. We mention Eusebius of Caesarea, Eusebius of Nicomedia, Constantine, Athanasius of Alexandria, Origen of Alexandria, Ambrose of Milan, Augustine of Hippo, Martin Luther, John Calvin, Arius of Alexandria, Hillary of Poitiers, Photinus of Galatia, Basil the Great, Gregory of Nyssa, Gregory of Nazianzus, and more.