#In many ways this is dependent on the Carolingian paradigm of royalty which differed from its Merovingian predecessors

[wonder-worker]

Angelberga was a peculiarly prominent personality in manifold aspects of European politics [in the late 9th century. Born to the Supponid family of Italy, she married Emperor Louis II and had several opportunities to establish her position as an active and controversial player in the vicissitudes of her husband's reign]. She acted as Louis's regent, accompanied him on expansionary military campaigns in the south of the peninsula and represented him at [congresses, tribunals, and diplomatic negotiations]. Strikingly, she was also the beneficiary of a spectacular collection of charters. Almost one in seven of Louis II’s extant charters were issued in her favour. Angelberga’s conspicuous exploits in the field of charter acquisition did not diminish after the emperor’s death, and this helped her to maintain a position as a key power-broker in Italian politics, control of land [particularly monastic foundations] being a fundamental building-block of power in this period. In the interregnum following 875, during which Charles the Bald of West Francia and Karlmann of Bavaria fought to claim the succession to the heirless Louis, Angelberga herself conducted the negotiations and decided the loyalty of a major sector of the Lombard political community. She maintained this high profile until her death [having supported her son-in-law Boso's quest for power, endured a temporary exile, maintained the support of Pope John VIII, and founded the monastery of San Sisto in the city of Piacenza, where she probably ended her days sometime before 891].

— Simon MacLean, "Queenship, nunneries and royal widowhood in Carolingian Europe"