Question: Justo Perez Santiago was an abbot of what Monastery that has a memorial in the municipality of San Lorenzo de El Excorial? 
Sentence (from "Valle de los Caídos"): The Valle de los Caídos (] , "Valley of the Fallen") is a Catholic basilica and a monumental memorial in the municipality of San Lorenzo de El Escorial, erected at Cuelgamuros Valley in the Sierra de Guadarrama, near Madrid, conceived by Spanish dictator Francisco Franco to honour and bury those who died in the Spanish Civil War.
Relevant evidence: Yes