He was expelled from the realm by Mauregatus, and on 26 November 783, Adosinda was put in the monastery of San Juan de Pravia, where she lived out the rest of her life.
Her paternal grandfather was Pedro de Cantabria and her maternal grandparents were King Pelagius (Don Pelayo in Spanish) and Queen Gaudiosa.
After King Fruela I was assassinated in 768, Adosinda feared for the life of her nephew Alfonso, son of her late brother and so sent him to the monastery of San Julián de Samos, in Lugo, in order to give him protection and cultural training.
Upon the death of her husband without any heirs, Adosinda intervened in the election of his successor to appoint her nephew, Alfonso, the son of King Fruela I.
However, King Mauregato, her half brother and the illegitimate son of Alfonso I el Católico, seized the throne, leading to Adosinda and her nephew seeking refuge in Alava.