That is hard to pinpoint. If we count the fall of Rome as the leading event in 410 AD I would say it was in Italy.
China fell
France
France
France
europe
Opa gahngnam style
anglo saxon times
Anglo saxon times
Feudalism began approximately during the 11th century and ended around the 15th century.
how many years ago was feudalism introduced if began about 800 ce
Simple, there was no government and it filled that need.
Feudalism first emerged among the franks
the population began to grow because feudalism increased