It was founded on 5 January 924 by Sancho Garcés I and Toda Aznárez, monarchs of Navarre, in gratitude for the recent reconquest of Nájera and Viguera (923) in conjunction with Ordoño II of León. The community was founded 'secundum Benedicti regulam uel id quod a sanctis patribus didicisti, that is, according to the Benedictine rule. It took its name—monasterium Albaidense or Albaildense—from the Muslim fortress of al-Bayadh (the White), on the site of which it was founded. Its first abbot was named Peter, but on 5 January 925, in a royal privilege granted on the anniversary of its founding, the abbot was Gabellus, suggesting that the monastery had perhaps been attacked during the invasion of Abd ar-Rahman III the previous year.