Church of Mercy in Aveiro is located in the same square as the Town Hall. Initially, the church was responsible for the project by the Italian architect Filippo Terzi. Building under his leadership, it was launched in 1585. It is worth noting that the architect also built many other buildings in Portugal, which included not only the church but also the forts. The church was built a very long time. Completing the construction in 1653 is another architect, the Portuguese Manuel Azen.

Temple famous for its grand portal and facade decorated with tiles azulezush-XIX century. The facade of the temple is decorated with generating a strong enough impression classical portal, made of limestone. Later in the decoration of the portal were added Baroque elements. Entrance to the church is decorated with four Corinthian columns. At the bottom of the columns are made between the niche in which there are stone sculptures. At the top, as in the niches between the columns used to be a statue, but then instead of them they made the window. In addition, the facade is decorated with a stone statue of Our Lady of Charity. At the very top of the facade is the royal shield and an armillary sphere (an ancient astronomical device).

Inside, the church has a long high nave and very luxuriously decorated. The walls are covered with tiles, azulezush with patterned ornament of the XVI century. In the altar of the temple attracts a vaulted ceiling. It should be noted that the ceiling made of stone brought from the province of Ansan, and is used in the construction of the monuments in this part of Portugal.