 The sacristy was begun in 1621 based on architectural plans by Mario Arconio and completed by Paolo Maruscelli in 1629.In the sacristy is a marble sculptural group of "S. Filippo with an Angel" by Alessandro Algardi.The wall frescoes are by Francesco Trevisani and the "Benediction by Christ" by Cerrini with the ceiling frescoed with "Angels carrying the instruments of the Passion" (1633–34) by Pietro da Cortona.