San Diego de Alcalá Parish Church, commonly known as Polo Church, is one of the oldest historical landmarks in Valenzuela City, located about 15.5 kilometers north of Manila. It is under the jurisdiction of the Diocese of Malolos. The original church was completed in 1632, following the establishment of Polo as an independent settlement in 1623. Historical records note that local residents were required to render labor during its construction under the Spanish colonial system.