Cardinal Lamberto left Rome with a large sum of money and several documents. Fearing that their corruption will be exposed, Keinszig, Lucchesi, and Gilday plot to murder the Pope. Gilday poisons the pontiff's tea, killing him in his sleep. The character of Lamberto and the film's depiction of the events which led to his murder are based upon one of the conspiracy theories surrounding the sudden death of the real-life Pope John Paul I, Albino Luciani. Like the Lamberto character, Luciani was discovered dead in his bed in 1978, 33 days after his election to the papacy. Various theories, such as the
History of the papacy of the peninsula known as the Papal States. Thereafter, the role of neighboring sovereigns was replaced by powerful Roman families during the "saeculum obscurum", the Crescentii era, and the Tusculan Papacy. From 1048 to 1257, the papacy experienced increasing conflict with the leaders and churches of the Holy Roman Empire and the Byzantine Empire (Eastern Roman Empire). The latter culminated in the East–West Schism, dividing the Western Church and Eastern Church. From 1257–1377, the pope, though the bishop of Rome, resided in Viterbo, Orvieto, and Perugia, and then Avignon. The return of the popes to Rome after the Avignon Papacy