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
Renaissance Papacy families, but also to enforce and expand upon the longstanding territorial and property claims of the papacy as an institution. Although before the Western Schism the papacy had derived much of its revenue from the "vigorous exercise of its spiritual office," during this period the popes were financially dependent on the revenues from the Papal States themselves. With ambitious expenditures on war and construction projects, popes turned to new sources of revenue from the sale of indulgences and of bureaucratic and ecclesiastical offices . Pope Clement VII's diplomatic and military campaigns resulted in the Sack of Rome in 1527. Pope