 "the location of Saint George, of the pieve of Parabiago, Duchy of Milan), while on maps of the Borromeo era (16th century) the town is mentioned as "Cascina Sancti Georgi Plebis Parabiaghi Duc.Mlni" ("Cassina di San Giorgio, of the pieve of Parabiago, Duchy of Milan").San Giorgio was a member until 1535 of the municipality of Legnano, from which it was divided after the administrative reform of Charles V, Holy Roman Emperor.