Charlemagne´s imperial coronation on Christmas Day 800 symbolized the revival of a Roman vision of imperium, not merely in title but in substance as well. Charlemagne ruled practically the whole of Latin Christendom, and a sequence of reform initiatives generated much greater Christian uniformity across the Latin West. And all of this at the command of Carolingian emperors, not of Roman popes. The great imperially sponsored monasteries, such as St. Gall, and the schools established in households of the (arch) bishoprics were the intellectual centres through which a real unity in the western Church was built up. (P. Heather, ´From Constantine to Charlemagne´ in M. Bormpoudaki a.o. (Eds.), Crossroads, Amsterdam 2017).