 The "Alessandro Mattei" listed in the final branch of the family tree above, though sources suggests he undertook an ecclesiastic career, is not Alessandro Mattei (1744–1820).Ironically though, the latter Alessandro was also nephew to a "Luigi Mattei"; born in 1702 who later became a cardinal (not the military Luigi Mattei listed above).Though direct relations are not clear, biographies of contemporaries Alessandro Mattei (1744–1820), Lorenzo Girolamo Mattei (1748–1833), Mario Mattei (1792–1870) and Ruggero Luigi Emidio Antici Mattei (1811–1883) suggest they were all related.