"Romance de lobos, comedia barbara" by Ramón del Valle-Inclán is a play written in 1908, forming part of the "Comedias bárbaras" trilogy. Set in rural Galicia at the end of the nineteenth century, it follows Don Juan Manuel, a nobleman who encounters the Santa Compaña while traveling drunk one night. This supernatural meeting sets in motion a dark tale of family conflict, inheritance disputes, and redemption as his sons fight over their mother's estate while their father seeks a death that continually eludes him.
Wikipedia page about this book: es.wikipedia.org/wiki/Romance_de_lobos