The book tells about the beginning of a new period of world history, marked by the victorious procession of the King of the Franks, affectionately nicknamed Charlemagne. Subsequently, the winner of the Lombards and Saxons, the conqueror of the Saracens, the one who was faithfully served by Roland of Breton and Guillaume of Toulouse - the legendary knights of the Franks - became emperor of all Christians Charlemagne.