The town of Magalang was started as a sub-parish of the neighboring town of Arayat on December 19, 1598 with Fr. Andres Hernandez as its vicar. In April 30, 1605, Magalang was officially separated from the mother town, Arayat; and Fr. Gonzalo de Salazar, OSA was appointed its first pastor. After Fr. Salazar's transfer, its parish was reverted back to Arayat. In 1686, Augustinian documents mentioned that Magalang together with Tarlac, was under the pastorship of Fr. Pedro de Flores, OSA. The town was initially located in Macapsa; and may have been relocated a few more times due to frequent flooding of the Chico River and subsequent revolts. In 1734, it was transferred to San Bartolome. In 1858, Magalang experienced devastating flood due to overflow of Parua River. Two years later, a Royal Decree was issued, creating the new town of Concepcion, composed of barrios of Magalang located on the northern bank of Parua River. In 1863, the town was eventually relocated to the present site. The northern part of Magalang was separated and formally created the town of Concepcion. However, the new town is still spiritually dependent on Magalang, until the Archdiocese of Manila issued a decree, establishing the latter's parish in 1866. The exact date of the construction of the present church remains unclear although, it is suggested in the records that the construction of a structure may have started at around 1725, when the convent of Magalang was relieved from paying its dues to the Augustinian province. The current church, was built by Fr. Ramon Sarrionandia, OSA in 1866. In 1875, Fr. Baltasar Gamarra, OSA finished the facade and the two storey bell tower. In 1887, Fr. Fernando Vasquez, OSA continued the finishing touches and installed two large bells in 1889 and 1890 respectively; and its tones is one of the best in whole Pampanga. Fr. Toribio Fanjul, OSA renovated the church flooring and sacristy in 1891. During the revolutionary period, the church convent was occupied by the revolutionaries, and it was converted into a prison for Spanish captives. On November 5, 1899, the Americans captured the convent from the revolutionaries, and they reconstituted as their military headquarters in Magalang until 1901. During Japanese occupation, Japanese soldiers stationed at the belfry, served as their observatory post. In early 50s, a major renovation of the church was done during the early administration of Rev. Fr. Pedro N. Magtoto. The old retablo was demolished, to give way the second altar, composed of large crucifix at the center of the altar. The wooden flooring are removed, and the choir loft was demolished. In 1978, the old convent was renovated and converted into parish hall during the administration of Rev. Fr. Odon T. Santos. During his administration also, the concrete Stations of the Cross were installed and the altar was further renovated. In 2002, Rev. Fr. Raul C. de los Santos renovated the altar and repaired the convent. In 2015, Rev. Fr. Mario Sol M. Gabriel initiated the revival of the original retablo. He also mechanized the existing old church bells, constructed the steel fence and installed a modern ventilation system inside the church. In 2017, National Museum of the Philippines bestowed the church as one of the Important Cultural Properties of the Philippines.
