Question

what event brought about the advent of feudalism in medieval europe?
the establishment of duchies in wales and england
the division of lands between charlemagnes grandsons
a papal decree enforced by the vatican church

Explanation:

The division of Charlemagne's empire among his grandsons led to political fragmentation. This fragmentation contributed to the rise of a decentralized social - political structure characteristic of feudalism, where local lords filled the power vacuum. The establishment of duchies in Wales and England was more a result of feudalism than its cause, and a papal decree was not the main factor in the advent of feudalism.

Answer:

the division of lands between Charlemagne's grandsons