After a long quarrel scattered with persecutions, uprisings, dismissals and replacements of religious authorities, deaths, military expeditions, confiscations and attempts of assassinations in Greece, Italy and other European areas, the Council of Nicaea, in 787, imposed the victory of the iconodules in the Byzantine Empire. The West, especially the Kingdom of the Franks and the Lombards ruled by Charles, later known as Charlemagne, tried to take an official position in the synod of Frankfurt in 794 and in an odd and complex treatise, comprising four books, entitled Opus Caroli, or Libri Carolini, which were recently attributed by Ann Freeman to Theodulf of Orleans, one of the greatest intellectuals of his time. In this work, which we could call the first western treatise on images, the icon is freed from its ritual and cult value, and returned to its artistic use, thus determining, according to some scholars, the larger freedom of figurative representation that characterizes western religious art as compared with the Orthodox one. This stance is followed by a lively debate, involving many authors, the materials of which have not yet been translated and put into full circulation in historical-artistic research.