| A | B |
| Domes | Rounded tops or roofs that look like half of a ball (15.G) |
| Aqueduct | A man-made waterway that brings water supplies to cities (15.4) |
| Vault | An arch that forms a ceiling or roof (15.4) |
| Oratory | The art of public speaking (15.4) |
| Epic | A long poem that tells about a hero's adventure (15.4) |
| Bas-Relief | A style of sculpture (15.4) |
| Mosaic | A picture made from tiny pieces of colored stone or other material (15.4) |
| Eastern Orthodox Church | The Christian Church in the East (15.3) |
| Roman Catholic Church | The Christian Church in the West |
| Justinian Code | A uniform code of law in the Eastern Roman Empire (15.3) |
| Justinian | Emperor of the Eastern Roman Empire (15.3) |
| Byzantine Empire | The Eastern Roman Empire (15.3) |
| Plunder | To take things by force (15.2) |
| Barbarian | People who lived outside the Roman Empire (15.2) |
| Absolute Ruler | A ruler who has total power (15.1) |
| Diocleatian | A Roman emperor who divided the empire in two (15.1) |
| Mercenary | A soldier for hire |