Sforza (i. e. stormer), Italian family celebrated during the 15th and 16th centuries, founded by a military adventurer, a peasant of the name of Muzia Allendolo, and who received the name; they became dukes of Milan, and began by hiring their services in war, in which they were always victorious, to the highest bidder, the first of the number to attain that rank being Francesco Sforza, the son of the founder, in 1450 (1401-1466), the last of the series being François-Marie (1492-1535).