A ruler of this name introduced a symbolic military standard called the labarum.
A ruler of this name introduced a symbolic military standard called the labarum. The fifth Byzantine emperor of this name, a son of Leo the Isaurian, was nicknamed "Copronymus" for defecating at his baptism. An early ruler of this name defeated his colleague Licinius at Chrysopolis, as described by Eusebius of Caesarea. The last member of the Paleologus dynasty held this name, and tore off his imperial clothing before charging into (*) Mehmet II's troops in 1453. The homoousios compromise came from Saint Helena's son of this name, who saw a vision in the sky before defeating Maxentius at Milvian Bridge and co-issuing the Edict of Milan. For 10 points, give this name of eleven emperors who all used a namesake capital in the Eastern Roman Empire.
A ruler of this name introduced a symbolic military standard called the labarum.
Constantine [accept Constantine the Great; accept Constantine V Copronymus; accept Constantine XI Paleologus]