In the early ninth century, a Frankish courtier used a tale of a demonic possession to criticize the realm’s leaders for their numerous sins. The demon, Wiggo, revealed all the destruction and suffering he had caused to the land of the Franks due to the people’s perverseness and the sins of their rulers. This story reflects the tensions and divisions within the Carolingian Empire during a time of crisis and upheaval. The courtier, Einhard, cleverly used this supernatural tale to convey a powerful critique of elite greed and political turmoil, highlighting the general misery caused by the ruling class.
https://www.smithsonianmag.com/history/how-a-tale-of-demonic-possession-predicted-the-decline-of-an-early-medieval-empire-180985596/