 The manuscript mentioned by Mabillon, and rediscovered by Ranke, in Karlsruhe, is older than the tenth century Monte Cassino copy.The earliest printed edition is that of Speyer in 1482.In the Cologne edition (sixteenth century) the authorship is ascribed to Alcuin, but the royal decree alluded to leaves no doubt as to the purpose or author; Alcuin may have revised it.