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The papal chapel, located in the eastern section of the medieval Lateran Palace, was dedicated to St Nicholas of Myra. It was founded by Callistus II (1119-1124), presumably in 1123. S. Nicola was not considered an independent church in the Middle Ages. Its painted vestibule pro secretis conciliis was known to several 12th century authors (Rodrigo of Toledo, Arnulf of Lisieux, Otto of Freising, John of Salisbury, Suger of Saint-Denis). The chapel of S. Nicola in Palatio and its vestibules were particularly significant for their pictorial decoration reflecting the papacy's victory in the struggle against the empire for temporal and spiritual power. The highlight of its decoration was the apse, painted with an iconographic programme celebrating the Reformation papacy and its victory over its adversaries during the struggle for investiture. Papal figures and scenes of papal victory were accompanied by inscriptions, emphasising the Church's triumph over discord and heresy.