House of Sforza
Sforza was born at Lucca, the second son of Count Giovanni Sforza (1846-1922), an archivist and noted historian from Montignoso, Tuscany, and Elisabetta Pierantoni, born in a family of silk merchants. His father was a descendant of the Counts of Castel San Giovanni, an illegitimate branch of the House of Sforza who had ruled the Duchy of Milan in the fifteenth and sixteenth centuries. At the death of his older brother in 1936, Carlo inherited the hereditary title of Count granted to their father in 1910.