Bertha (c. 780 – after 11 March 824) was the seventh child and third daughter of Charlemagne, King of the Franks, by his second wife, Hildegard.
Bertha was raised with her brothers and sisters in the royal household of Charlemagne, who had all of his children educated by tutors.
Angilbert ended his affair with Bertha and entered a monastery, becoming Abbot of St. Riquier, according to a biography written by their son, Nithard.
Nithard was a distinguished soldier and politician, and acted as an advisor to Charles the Bald of France.
[4] Following the death of Charlemagne, his successor, Louis the Pious, exiled his sisters to the convents that had been left for their inheritance by their father.