 Palacio Valdés was a good friend of Clarín.He wrote several important novels, among them "Marta y María", in which the two Biblical sisters are transported to a contemporary setting and fight against the false mysticism of the time.The most popular of his works is "La monja de San Sulpicio" ("The Nun from San Sulpicio"), in which he narrates the adventures that precede the marriage of a Galician doctor with the protagonist, a nun without vocation who does not renew her vows.