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| English | Russian |
| Felix IV | Феликс IV (or III) (Pope from 526 to 530. He ended the controversy over grace at the second Council of Orange in 529 by condemning Semi-Pelagianism, and converted a pagan temple at Rome into the Church of SS. Cosmas and Damian; III) |
| Stephen IV | Стефан IV (or V) (Pope from June 816 to January 817. Immediately after his consecration he ordered the Romans to swear fidelity to the Carolingian emperor Louis I the Pious; V) |