Analysis of information sources in references of the Wikipedia article "Costanzo I Sforza" in English language version.
Giovanni Sforza was an illegitimate fon of Constanzo Sforza, who had no issue by his wife Camilla. ... He married Lucrezia Borgia, daughter of Pope Alexander VI., and was foon afterwards driven from Pefaro by Cæsar Borgia, his wife's ..