	From the time of St. Ambrose, whose hymns are well-known and whose liturgical allusions may certainly be explained as referring to a rite which possessed the characteristics of that which is called by his name, until the period of Charlemagne (circ AD 800), there is a gap in the history of the Milanese Rite. However, St. Simplician, the successor of St. Ambrose, added much to the rite and St. Lazarus (438-451) introduced the three days of the litanies. ("Cantù, Milano e il suo territorio", I, 116) The Church of Milan underwent various vicissitudes and for a period of some eighty years (570-649), during the Lombard conquests, the see was moved to Genoa in Liguria.