Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.

Context: Justo Perez Santiago (August 7, 1895 -- 1979) later known as Fray Justo Perez de Urbel y Santiago O.S.B. was a Spanish Roman Catholic clergyman (Order of Saint Benedict) and medievalist, first abbot of the Monastery of the Holy Cross of the Valle de los Caidos, member of the Consejo Nacional del Movimiento (the first quasi-parliamentary assembly of Francoist Spain), later a Procurador en Cortes (member of the longer-lived Francoist assembly established after the end of the Spanish Civil War) and distinguished scholar of medieval Castile.
Question: To which religious order did Justo Perez de Urbel belong?
order of saint benedict