On April 28, 1934, Pope Pius XI promulgated an apostolic constitution with the incipit Romanorum Pontificum semper separating the dioceses of Cebu, Calbayog, Jaro, Bacolod, Zamboanga and Cagayan de Oro from the ecclesiastical province of Manila.
On April 28, 1934, Pope Pius XI issued an apostolic constitution "Romanorum Pontificum semper" that established a new structure for the Catholic Church in the Philippines by separating the dioceses of Cebu, Calbayog, Jaro, Bacolod, Zamboanga and Cagayan de Oro from the ecclesiastical province of Manila.