Ratti is a family of chiefly Italian extraction. The earliest evidences of the family are related to Piedmont (11th century) and Liguria (12th century). A minor branch originates from Premana, where it was recorded since the early 15th century. Mentone, Opizzone and Lizoli are the major offshoots of the family. Among the eminent members are Giovanni Agostino Ratti, Carlo Giuseppe Ratti and Pope Pius XI (Ambrogio Damiano Achille Ratti).