Санта-Мария-ин-Космедин
Mattei was raised to cardinal deacon in 1586 with the diaconias of Sant'Adriano al Foro and Sant'Agata dei Goti (1587) then Santa Maria in Cosmedin (1587–89), then the titular church of San Pancrazio fuori le mura from 1592 to 1603.