The principal, and to my mind, insuperable objection to Msgr. Ceriani’s theory is as follows. Supposing that the Milanese liturgy did come from Rome, and is, as Bl. Ildephonse Schuster once said, more Roman in origin than the current Roman Rite itself: when and why did it begin to consistently reject all subsequent changes made to the Roman Rite, changes which are manifestly not “secondary”, when they were accepted by absolutely everyone else who used that rite? A host of similar objections might also be raised, such as the completely different chant, and the radically different structure of the Divine Office.