San Ildefonso de Toledo Parish Church, commonly known as Tanay Church, is a remarkable example of Baroque architecture. Constructed between 1773 and 1783, it was declared a National Cultural Treasure by the National Commission for Culture and the Arts (NCCA) in 2001, recognizing its historical and cultural significance. The 400-year-old Tanay Church is considered as one of Rizal province’s key pilgrimage sites.

The church’s architectural design showcases its Baroque influences, featuring arched fenestrations, pilasters along the lateral walls, and modestly adorned side portals. Its heavily ornamented south façade is divided into three horizontal levels by decorative moldings and friezes, culminating in a triangular pediment. Vertically, engaged superimposed columns split the façade into three bays. A rounded belfry further highlights its Baroque style.

The church is dedicated to San Ildefonso de Toledo, a 7th-century Spanish archbishop and theologian known for his profound devotion to the Virgin Mary. He is celebrated for the “Miracle of the Virgin’s Chasuble,” in which the Virgin Mary is believed to have appeared to him, gifting a sacred vestment as a sign of favor. His theological contributions and Marian devotion continue to inspire veneration, with his feast day observed on January 23.

At the large courtyard of the church, a striking wooden sculpture depicts San Ildefonso praying before the Blessed Virgin Mary, carved from the trunk of a century-old acacia tree. The church also houses a relic—a piece of bone of San Ildefonso—enshrined in a monstrance donated in 2006 by Felipe Pedraja from Zamora, Spain, where the saint’s remains rest.