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 Valley of the Fallen, as a surviving monument of Franco's rule, and its Catholic basilica remain controversial, in part since 10% of the construction workforce consisted of convicts, some of whom were Spanish Republican political prisoners.
Relevant evidence: No