"Prüm Abbey is a former Benedictine abbey in Prüm, now in the diocese of Trier (Germany), founded by the Frankish widow Bertrada the elder and her ...
son Charibert, Count of Laon, in 721. The first abbot was Angloardus.
The Abbey ruled over a vast hinterland comprising dozens of towns, villages and hamlets. Its abbot enjoyed the status of a prince (Fürst) of the Holy Roman Empire, and as such had seat and vote on the Ecclesiastical Bench of the College of ruling princes of the Imperial Diet. After 1574, the archbishops-electors of Trier became the "perpetual administrators" of Prüm Abbey which, while preserving its princely status, became, de facto, an adjunct of Trier." - (en.wikipedia.org 26.07.2021)