The College of the Immaculate Conception (CIC) traces its roots from the institution founded by Rev. Fr. Ruperto T. Rosario, then parish priest of Cabanatuan City, when he founded the San Nicolas Catholic School in 1926. In 1936, the school was renamed Cabanatuan Institute by its then Director, Rev. Carlos S. Inquimboy. In that same year also, the Reverend Sisters of St. Paul de Chatres came and helped in the administration of the School for four years. To the reverend Sisters were attributed the opening to the public the secondary courses, and the establishment of a dormitory for girls.