Alfonso II El Casto (The Chaste).
759-842, King of Asturias.
The Crónica Sebastianense records his death in 842, saying:
tras haber llevado por 52 años casta, sobria, inmaculada, piadosa y gloriosamente el gobierno del reino [after having held for 52 years chastely, soberly, immaculately, piously, and gloriously the government of the realm]