Johannes: emperor of the West-Roman empire (423-425).
- Year of birth unknown; possibly of Gothic descent
- 20 November 423: recognized by the Senate as emperor
- May/June 425: executed by East-Roman troops
Successor of: Honorius
- 423 Becomes emperor in Rome; not recognized by Theodosius II in the east, who supports his relative Valentinian III
- 425 Consul (not recognized outside Rome); executed by East-Roman troops
Succeeded by: Valentinian III