On January 27, 1983 the late Pope John Paul II approved the division of the island of Mindoro into two vicariates – the Apostolic Vicariate of Calapan covering all the towns in Occidental Mindoro and the Apostolic Vicariate of San Jose which is composed of the twelve parishes in the eleven towns of Occidental Mindoro.
The spiritual welfare of the Catholics in Oriental Mindoro remained under the governance of Bishop Simeon Valerio, SVD, DD but that of Occidental Mindoro was entrusted to Bishop Vicente Manuel, SVD, DD. Bishop Manuel was officially installed on July 1, 1983 in a ceremony officiated by the representative of the pope in the Philippines, Archbishop Bruno Torpiglianni, DD. From that time, the parish church of San Jose was converted into a cathedral.
Reference: HISTORY OF SAN JOSE by Rudy Candelario. (http://sites.google.com/site/occidentalmindorohistory/historysanjose)