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 invaded Italy. Italy became a constituent kingdom of the Holy Roman Empire in 962, from which point the emperors were German. As emperors consolidated their position, northern Italian city-states would become divided by Guelphs and Ghibellines. Henry III, Holy Roman Emperor found three rival popes when he visited Rome in 1048 because of the unprecedented actions of Pope Benedict IX. He deposed all three and installed his own preferred candidate: Pope Clement II. The history of the papacy from 1048 to 1257 would continue to be marked by conflict between popes and the Holy Roman Emperor, most prominently the Investiture