In the 14th century, the 3 richest places in the world were China, the Middle east (Iran, Irak) and Africa (Mali Empire with Mansa Musa).
When the Mongols arrived in Europe in the 14th century, they were very disappointed. The place was so poor. There were nothing worthy looting, so as usual they killed all the local aristocracies, and return back home.
Killing the local aristocracies in Asia and Europe in the 14th centuries was the single most important gift the Mongols have brought to Europe and to the modern world.
Where ever you found a local or global aristocracy, without exception, all aristocracies are always against innovation, which