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 Caídos,[2] 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.

[9] After the Nationalists won the Civil War, he was named Prior of the Church of Montserrat in Madrid (associated with the abbey of Silos)[8] and chaplain of the Women's Section of the Falange.

[citation needed] At the same time, he was designated as the person to approve or reject applications to establish new comic books.

[10] Pérez Santiago was a member of the Consejo Nacional del Movimiento (the first quasi-parliamentary assembly of Francoist Spain).

Also at Silos, he became acquainted with several languages, acquiring fluent French, decent English and German, and a good familiarity with Hebrew, Greek, Latin, and Arabic.

[8] He was also Honorary Counselor of the Spanish National Research Council (CSIC) and Director of the Colegio Mayor "Marqués de la Ensenada".