The Ermita de San Jacinto in Tuguegarao was established in 1604 by Dominican missionaries as an early chapel serving the growing settlement. It predates the St. Peter Metropolitan Cathedral by about a century and is considered the oldest existing brick structure in the city. Originally a small visita, it functioned as a place of worship for residents before larger church structures were built.

It was not originally part of my planned Visita Iglesia across Isabela and Cagayan, but it was recommended to me because it is recognized as the oldest structure in Tuguegarao. The suggestion made sense, especially given its historical significance in the early development of the city.

The chapel was reconstructed in 1724, giving it a more permanent stone form. Its simple brick construction reflects the architectural style used by the Dominicans in the Cagayan Valley during the Spanish colonial period. Because of its location and durable materials, it remained intact through various historical events, including colonial transitions and periods of conflict.

The ermita is dedicated to Saint Hyacinth, the patron saint of Tuguegarao, and continues to be associated with local religious practices and annual celebrations. Over time, it has also been used for different purposes, including as a temporary station during military occupation in the early 20th century.