Built at the end of the 17th century, the baroque church is one of the most important monuments in Warsaw. It was designed by outstanding architects: the designer was  royal court architect Józef Bellotti, and the front and towers are the work of Jakub Fontana. It was here that in 1683, King Jan III Sobieski announced his trust in God, himself and the motherland before the Turkish siege on Vienna. In the pillars of the temple, there are urns containing the hearts of composer Fryderyk Chopin and Nobel prize-winning writer Władysław Reymont. In the church the epitaphs of outstanding Poles are located, including Bolesław Prus, Józef Ignacy Kraszewski, Juliusz Słowacki and Władysław Sikorski. Before the façade on the front of the stairs, the figure of Christ holding the cross stands with “Sursum Corda” (“Hearts Up”) written on the plinth – this statue is one of the most characteristic elements of Krakowskie Przedmieście. Every Sunday, the Holy mass which takes place here is broadcast over the radio.