The Benedictine monks came to the Philippines on September 12, 1895. They started missionary work in Surigao in 1896. Rt. Rev. Jose Deas Y. Villar, OSB founded the Benedictine community in Mindanao. A few years later, after the monks' Mindanao mission, the Benedictine community transferred their residence and apostolate to Balmes Street in Quiapo, Manila.Under the leadership of Fr. Juan Sabater, OSB, El Colegio de San Beda (now San Beda University) was established in 1901 in Mendiola, Manila.Restiveness marked the late 1960s and the early 1970s, which led to the decision by the Benedictine monks to establish another campus outside Manila. They decided on Alabang in Muntinlupa as the site of the new campus. A modern edifice was constructed in 1972 on a nine and a half hectare lot inside the Alabang Hills Village. On July 10, 1972, Benedictine Abbey School (BAS) opened its doors to 78 preschool boys and girls. Fr. Roberto de Jesus, OSB, who was the first Rector, supervised the growing years of the new institution. BAS opened its high school department in 1977.Both elementary and high school departments later gained accreditation from the Philippine Accrediting Association of Schools, Colleges and Universities (PAASCU).