Specifically by Friar Francisco de Niz de Santa María.

It is a church dedicated to Our Lady of Mercy.

It holds historical significance as two Mercedarian friars who were brothers, Friar José Lozano and Friar Florentino, played an active role in the Independence movements of the early 19th century. In fact, they were arrested and expelled for a period of time.

The interior features beautiful frescoes on its walls and ceilings, contrasting with its sober façade. Several works are attributed to the "three Marians" of the Queretan School of Sculpture (Mariano Arce, Mariano Perrusquia, and Mariano Montenegro), including the magnificent image of Our Lady of Mercy located in the main altar.

Other notable carvings include the crucified Christ in the chapel of the Holy Child of Health, the Jesus of Nazareth located in the entrance on the right side of the temple, and the Dolorosa (Sorrowful Virgin) found in the first niche on the right side.