Roman Catholic Diocese of Malolos

Bulacan was Christianized in the 1572 by the Augustinian Friars headed by Fray Diego de Herrera, Martin de Rada and Fray Diego Ordoñez de Vivar from Guadalajara Mexico the Western Bulacan became the centers of Augustinians Order in Towns of Calumpit with Hagonoy and Apalit, Bulakan with Bigaa and Caluya, Malolos with Quingua while on the Southern part comprising the Old Meycauayan was Christianized by Franciscans in 1578.

Bulacan Province which lies in the Central Plains of Luzon, or Region III. Bulacan is bounded by Nueva Ecija on the north, Aurora (Dingalan) on the northeast, Quezon (General Nakar) on the east, Rizal (Rodriguez) on the southeast, Metro Manila (Valenzuela City, Malabon City, Navotas City, Caloocan City and Quezon City) on the south, Manila Bay on the southwest, and Pampanga on the west. The province of Bulacan is rich in rice, in fruits and in poultry and fishpond production. Other products are sugar and corn.

Historically, Bulacan, together with other Central Luzon provinces, was among the first to take up arms against Spanish authorities. It played an important role in the Philippine Revolution of 1896. When the capital of the new Republic was moved from Bacoor in Cavite to Malolos in Bulacan, the First Revolutionary Congress met at the Barasoain Church, a landmark in Philippine history, to draft the first constitution of the First Philippine Republic. And on January 21, 1899 Emilio Aguinaldo, the first president of the First Philippine Republic, promulgated what is now known as the Malolos Constitution. It was the first important Filipino document to come out of people's representation.

Prior to the creation of the Diocese of Malolos, it is part of Archdiocese of Manila as Vicaria de La Inmaculada Concepcion or Vicaria dela Provincia de Bulacan with Malolos Church as the headquarters of Vicariate of Bulacan comprising the whole Province of Bulacan but later the province was divided into two vicariates, other one is for Franciscan riconandas of Meycauayan including Polo (now Valenzuela City)

The Diocese of Malolos was created upon the Papal Bull "Christi Fidelium" November 25, 1961 and it was officially opened on March 11, 1962, the Malolos Church became Cathedral and the site of the canonical installation of the first resident bishop of Malolos, Most Reverend Manuel del Rosario, D.D. For Malolos, it was a new chapter in its already fabled history. It was the late Pope John XXIII who created the Diocese of Malolos as a suffragan of the Archdiocese of Manila. In the celebration, Bishop del Rosario was installed by Archbishop Salvatore Siino, then papal nuncio to the Philippines.

In Guiguinto, Bulacan town, the Immaculate Conception Minor Seminary The seminary, considered the nucleus potential of the diocese, has become the alma mater of two hundred and fifty priests who have now assumed responsible positions in the diocese and its 100 plus parishes. The seminary has grown to include new buildings for a college seminary, a formation institute, and theology school.

A few years later two auxiliary bishops were assigned to Malolos: Most Reverend Leopoldo Arcaira who arrived in 1966, then Most Reverend Ricardo Vidal. When Monsignor Vidal was elevated to the position of archbishop and was assigned to Lipa, Pope Paul VI gave Malolos a young and energetic prelate, Most Reverend Cirilo R. Almario, Jr. He became the bishop of Malolos from December 15, 1977 up to January 20, 1996.

The third bishop is the former auxiliary bishop of Manila, Most Rev. Rolando Tria Tirona, OCD, a Carmelite Discalced. He started his episcopacy on the December, 1996. He was later transferred in June 2003 to the Prelature of Infanta to replace another Carmelite Discalced prelate, Bishop Julio Xavier Labayen, OCD. He is now the Archbishop of Nueva Caceres.

The fourth bishop is a priest from the Diocese of Gumaca in Quezon and formerly a Bishop of the Diocese of Boac, Marinduque, Most Rev. Jose Francisco Oliveros, DD. He took the office on May 14, 2004 and died on May 11, 2018.

The fifth bishop is a priest from the Archdiocese of Cebu in Cebu and formerly an Auxiliary Bishop of the Diocese of Cebu, Most Rev. Dennis C. Villarojo, DD. He took the office on May 14, 2019.

The Diocese of Malolos comprises the entire civil province of Bulacan and the city of Valenzuela in Metro Manila. Its titular patron is the Immaculate Conception whose solemnity is celebrated December 8. The population covered by the diocese is 1,650,000 of which 85 per cent are Catholics.

In June and July 1987, Bishop Cirilo Almario convened the First Diocesan Synod of Malolos. It had for its theme: "To Prepare for the Lord a Perfect People." Together with the priests and the Christian faithful of the province the Synod formulated its own vision-mission statement. To fulfill its mission, a restructuring of the diocesan organization was called for in line with the spirit of Vatican II.

The Second Synod of the Diocese was convened by Most Rev. Jose F. Oliveros, DD. It was held from April 8 to April 13, 2016. It had the theme "Contemplating the face of Christ and proclaiming God's transforming grace with unwavering faith towards the new evangelization in the Diocese of Malolos."

Diocese of Malolos' present Organizational chart photo in the convent.

The Diocese's fourth Bishop José Francisco Oliveros, in a solemn Mass at the Malolos Cathedral.

• Manuel P. del Rosario†: 11 Dec 1965 Appointed – 15 Dec 1977 Resigned, 23 March 2009 Died
• Cirilo R. Almario, Jr.†: 15 Dec 1977 Succeeded – 20 Jan 1996 Resigned, 14 October 2016 Died
• Rolando Octavus Joven Tria Tirona: 14 Dec 1996 Appointed – 28 Jun 2003 Appointed, Prelate of Infanta
• Jose Francisco Oliveros†: 14 May 2004 Appointed – 11 May 2018, Died
• Dennis Cabanada Villarojo: 14 May 2019, Appointed - 21 August 2019 - Installed by Luis Antonio Gokim Tagle

• Catholic Church in the Philippines