| A | B |
| Justinian | Byzantine emperor who reorganized government and sponsored a code of laws |
| Moscow | city from which Prince Igor of Russia tried unsuccessfully to invade Byzantium |
| Constantinople | capital of the Byzantine empire |
| Rome | capital of the western Roman Empire and the center of the Roman Catholic Church |
| Venice | Italian city that controlled Constantinople during its declining years |
| strait | narrow passage linking two bodies of water |
| icon | painting of a holy person |
| patriarch | leader of the Church of Constantinople |
| schism | split |
| Hagia Sophia | largest church in the Byzantine Empire |
| Greek fire | deadly weapon that exploded into flame when it contacted water |
| Empress Theodora | Justinian's wife |