Regnum et sacerdotium in Alsatian Romanesque Sculpture: Hohenstaufen Politics in the Aftermath of the Investiture Controversy (1130-1235)
Although no longer preserved today, a series of paintings in the St. Nicholas chapel of the Lateran palace in Rome incurred Frederick Barbarossa’s wrath because they presented his predecessor, King Lothar of Supplinburg (1025-1137), in a submissive position as the pope’s vassal