Byzantine Empire: The eastern half of the Roman Empire that existed from 330 AD to 1453 AD, with its capital in Constantinople (modern-day Istanbul).
Feudalism: A social and economic system during the medieval period where land was held by vassals or lords in exchange for their loyalty and military service.
Silk Road: A network of trade routes connecting Asia, Europe, and Africa that existed from around 100 BC to the 14th century AD.