The church of Santissima Trinita dei Pellegrini was rebuilt by the architect Martino Longhi the Elder and completed after his death by Giovanni Paolo Maggi. It was consecrated in 1616.
The curved façade was added about a century later to a design by Francesco De Sanctis, the architect who co-designed the Spanish Steps. The inscription reads: IOES DE RUBEIS PEDEMONTANVS IN SS.TRINITATIS HONOREM F. F. A. MD CCXXIII (Giovanni Rossi from Piedmont had this made in honour of the Holy Trinity in the year 1723). The four stucco statues depict the four evangelists.