Very close to the Campo di Fiore is the Chiesa della Trinita' dei Pellegrini where Mass is still said in Latin. It was one of the most ancient Roman churches dedicated to the leader of European monasticism. It was given to the Confraternity of Pilgrims by Paul IV in 1558. It was reconstructed and crowned with the dome in 1603-1616 by Giovanni Paolo Maggi. The façade was designed by Francesco De Sanctis 1723. The main altar has four columns of African black marble, and was built in 1616 by designs of Domenico Pozzi. The altarpiece depicts the Trinity (1625), a masterwork by Guido Reni.