 It is best known, like the Oratorio del Gonfalone, which shares the same artists, for its Mannerist decorations.The structure was built by Giacomo Della Porta in 1568, near the church of San Marcello, for the Confraternity of Crucifix, founded to venerate the Crucifix (crocefisso) from the nearby church.The confraternity was composed of some of the richest men in Rome, including the cardinals Ranuccio and Alessandro Farnese, nephews of the Pope.