Monarchy, republic, it made martyrs of the Christian people, and Augustus, Constantine, Diocletian I believe
It was the world's longest humanmade structure at more than four thousand miles actually constructed from a series of smaller walls that were connected together built to guard against Mongol invaders.
Hope this helps. :D
Answer:
Europe's Medieval Agricultural Revolution
Explanation: Crop yields multiplied by at least threefold. Europe's population followed suit, tripling in less than three centuries. The average European lifespan increased by as much as two decades. Towns and cities reemerged, and with them came new crafts and a revival of trade.
The Hellenistic Era was started due to the death of Alexander The Great.
