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 "Yanga, Veracruz"): It was formerly known as San Lorenzo de los Negros (after a colony of "cimarrons" in the early 17th century) or San Lorenzo de Cerralvo (after a 17th-century Spanish colonial priest).
Relevant evidence: No