Kirchenakte Documented events from judgments, reports and church documents
1478-1480 · 2 years · show in timeline

Florence 1478: Pazzi conspiracy with the pope's nephew, an archbishop and two priests; Giuliano de’ Medici stabbed to death during High Mass in the cathedral

Pope Sixtus IV was in conflict with Lorenzo de’ Medici, who thwarted the pope's plans for his nephews. His nephew Girolamo Riario, the banking family of the Pazzi and the Archbishop of Pisa, Francesco Salviati, planned the overthrow of the Medici. According to the confession of the mercenary captain Montesecco, the pope wanted a change of government in Florence, expressly without deaths, and consented to the employment of armed men. On 26 April 1478 conspirators stabbed Giuliano de’ Medici to death during High Mass in the cathedral; two clerics attacked Lorenzo and wounded him. The Catholic Encyclopedia and the Britannica write that the pope was cognisant of the conspiracy. After the archbishop was executed, Sixtus excommunicated Lorenzo, threatened Florence with interdict and waged war for two years.

Deaths
1 (counted, Giuliano de’ Medici, stabbed in the cathedral (the subsequent killings by Medici supporters are not counted))
Evidence: Encyclopædia Britannica, 11. Auflage (1911)
„the former was mortally stabbed by conspirators“
Medici. Original
Period
1478-1480 (2 years)
Country
Italy
Institutions
Pope Sixtus IV
Archbishop of Pisa Francesco Salviati
Papal States
Category
Violence, Murder
Level of evidence
B two independent scholarly sources · what does this mean?
Persons
Sixtus IV (pope, wanted the forcible overthrow of the Medici, consented to the use of armed men, then excommunication and war against Florence)
Girolamo Riario (nephew of the pope, according to Pastor an originator of the conspiracy)
Raffaele Riario (cardinal, nephew of the pope, according to the Catholic Encyclopedia a planner, according to Pastor unsuspecting)
Francesco Salviati (Archbishop of Pisa, co-conspirator, hanged after the attack)
Stefano da Bagnone (cleric, attacked Lorenzo de’ Medici in the cathedral)
Antonio Maffei (cleric from Volterra, attacked Lorenzo de’ Medici in the cathedral)
Giuliano de’ Medici (stabbed to death during High Mass in the cathedral of Florence)

What happened to the people

Who was affected? Victims and numbers

  1. On Sunday 26 April 1478 Giuliano and Lorenzo de’ Medici attended High Mass in the cathedral of Florence, to which the young Cardinal Raffaele Riario also came. Because Montesecco at the last moment refused to commit the deed in the church, the two clerics Stefano and Maffei undertook the attack on Lorenzo. At the beginning of the second part of High Mass, Bernardo Bandini Baroncelli plunged his dagger into Giuliano's side, and Francesco de’ Pazzi stabbed him repeatedly until he was dead. The two clerics wounded Lorenzo only slightly; he escaped into the sacristy.
    Evidence: Encyclopædia Britannica, 11. Auflage (1911), Artikel Medici, Abschnitt Lorenzo
    „On the 26th of April 1478, while Giuliano and Lorenzo were attending high mass in the cathedral of Florence, the former was mortally stabbed by conspirators, but the latter was able to beat back his assailants and escape into the sacristy.“
    Medici, Artikel Medici, Abschnitt Lorenzo. Original · Archive copy
    Evidence: hg. von Frederick Ignatius Antrobus, Kegan Paul, Trench, Trübner, London 1899, Bd. 4, S. 308
    „Montesecco, however, at the last moment refused to per“
    Ludwig Pastor, The History of the Popes from the Close of the Middle Ages, Bd. 4, Bd. 4, S. 308. Original
    Evidence: hg. von Frederick Ignatius Antrobus, Kegan Paul, Trench, Trübner, London 1899, Bd. 4, S. 309
    „the two clerics, Stefano and Maffei, undertook the deed.“
    Ludwig Pastor, The History of the Popes from the Close of the Middle Ages, Bd. 4, Bd. 4, S. 309. Original
    Evidence: hg. von Frederick Ignatius Antrobus, Kegan Paul, Trench, Trübner, London 1899, Bd. 4, S. 309
    „The beginning of the second part of the High Mass was the signal of action for the conspirators.“
    Ludwig Pastor, The History of the Popes from the Close of the Middle Ages, Bd. 4, Bd. 4, S. 309. Original
    Evidence: hg. von Frederick Ignatius Antrobus, Kegan Paul, Trench, Trübner, London 1899, Bd. 4, S. 309
    „Francesco de' Pazzi stabbed him repeatedly till life was extinct.“
    Ludwig Pastor, The History of the Popes from the Close of the Middle Ages, Bd. 4, Bd. 4, S. 309. Original
    Evidence: hg. von Frederick Ignatius Antrobus, Kegan Paul, Trench, Trübner, London 1899, Bd. 4, S. 310
    „attacked Lorenzo, but only wounded him slightly“
    Ludwig Pastor, The History of the Popes from the Close of the Middle Ages, Bd. 4, Bd. 4, S. 310. Original

How were they charged and sentenced?

  1. The sources differ on who planned the conspiracy. The Catholic Encyclopedia names the pope's nephew Cardinal Raffaele Riario, the Britannica a Cardinal Riario. Pastor names Count Girolamo Riario, also a nephew of the pope, with Francesco de’ Pazzi and Archbishop Salviati as the originators; the eighteen-year-old Cardinal Raffaele had no suspicion. According to the Britannica, the pope was acquainted with the whole matter; according to the Catholic Encyclopedia, he was cognisant of the plot, though probably not of the intention to assassinate.
    Evidence: The Catholic Encyclopedia, Bd. 14 (1912), Artikel Pope Sixtus IV
    „planned by the pope's nephew“
    Pope Sixtus IV, Artikel Pope Sixtus IV. Original · Archive copy
    Evidence: The Catholic Encyclopedia, Bd. 14 (1912), Artikel Pope Sixtus IV
    „Cardinal Rafael Riario“
    Pope Sixtus IV, Artikel Pope Sixtus IV. Original · Archive copy
    Evidence: Encyclopædia Britannica, 11. Auflage (1911), Artikel Sixtus, Abschnitt Sixtus IV.
    „Sixtus was cognisant of the conspiracy of the Pazzi, plotted (1478) by his nephew, Cardinal Riario, against Lorenzo de’ Medici.“
    Sixtus, Artikel Sixtus, Abschnitt Sixtus IV.. Original · Archive copy
    Evidence: hg. von Frederick Ignatius Antrobus, Kegan Paul, Trench, Trübner, London 1899, Bd. 4, S. 303, Anm.
    „were, as ClPOLLA, 582, says, "primi autori di tutta quella intricata matassa"“
    Ludwig Pastor, The History of the Popes from the Close of the Middle Ages, Bd. 4, Bd. 4, S. 303, Anm.. Original
    Evidence: hg. von Frederick Ignatius Antrobus, Kegan Paul, Trench, Trübner, London 1899, Bd. 4, S. 307
    „Cardinal Rafaello, who was but eighteen, had no suspicion“
    Ludwig Pastor, The History of the Popes from the Close of the Middle Ages, Bd. 4, Bd. 4, S. 307. Original
    Evidence: Encyclopædia Britannica, 11. Auflage (1911), Artikel Medici, Abschnitt Lorenzo
    „aided by the nephews of the pontiff, who was himself acquainted with the whole matter“
    Medici, Artikel Medici, Abschnitt Lorenzo. Original · Archive copy
    Evidence: The Catholic Encyclopedia, Bd. 14 (1912), Artikel Pope Sixtus IV
    „The pope was cognizant of the plot, though probably not of the intention to assassinate“
    Pope Sixtus IV, Artikel Pope Sixtus IV. Original · Archive copy
  2. The mercenary captain Giovan Battista da Montesecco, a vassal of Riario, stated after his arrest what the pope had said in an audience in the presence of Salviati and Girolamo. Beforehand Riario and Salviati had assured him that the pope would always do what they persuaded him to and earnestly desired it. In the audience Sixtus declared that he wanted a change of government in Florence, but on no condition the death of any man; Lorenzo was a villain. When Montesecco objected that this could hardly be done without the death of Lorenzo and Giuliano, the pope repeated that no one was to be killed. At the close of the audience, according to Pastor, he consented to the employment of armed men and told Salviati that he was content.
    Evidence: hg. von Frederick Ignatius Antrobus, Kegan Paul, Trench, Trübner, London 1899, Bd. 4, S. 303
    „Giovan Batista da Montesecco, a vassal of Riario's“
    Ludwig Pastor, The History of the Popes from the Close of the Middle Ages, Bd. 4, Bd. 4, S. 303. Original
    Evidence: hg. von Frederick Ignatius Antrobus, Kegan Paul, Trench, Trübner, London 1899, Bd. 4, S. 304
    „will always do what we persuade him, and he is angry with Lorenzo, and earnestly desires this“
    Ludwig Pastor, The History of the Popes from the Close of the Middle Ages, Bd. 4, Bd. 4, S. 304. Original
    Evidence: hg. von Frederick Ignatius Antrobus, Kegan Paul, Trench, Trübner, London 1899, Bd. 4, S. 304
    „the Pope from the first declared that he wished for a change of government in 'Florence, but without the death of any man.“
    Ludwig Pastor, The History of the Popes from the Close of the Middle Ages, Bd. 4, Bd. 4, S. 304. Original
    Evidence: hg. von Frederick Ignatius Antrobus, Kegan Paul, Trench, Trübner, London 1899, Bd. 4, S. 304
    „these things can hardly be done without the death of Lorenzo and Giuliano, and, perhaps, of others also“
    Ludwig Pastor, The History of the Popes from the Close of the Middle Ages, Bd. 4, Bd. 4, S. 304. Original
    Evidence: hg. von Frederick Ignatius Antrobus, Kegan Paul, Trench, Trübner, London 1899, Bd. 4, S. 305
    „Go and do as seems good to you, but no one's life is to be taken.“
    Ludwig Pastor, The History of the Popes from the Close of the Middle Ages, Bd. 4, Bd. 4, S. 305. Original
    Evidence: hg. von Frederick Ignatius Antrobus, Kegan Paul, Trench, Trübner, London 1899, Bd. 4, S. 305 f.
    „At the close of the audience, he gave his consent“
    Ludwig Pastor, The History of the Popes from the Close of the Middle Ages, Bd. 4, Bd. 4, S. 305 f.. Original
    Evidence: hg. von Frederick Ignatius Antrobus, Kegan Paul, Trench, Trübner, London 1899, Bd. 4, S. 306
    „to the employment of armed men“
    Ludwig Pastor, The History of the Popes from the Close of the Middle Ages, Bd. 4, Bd. 4, S. 306. Original
    Evidence: hg. von Frederick Ignatius Antrobus, Kegan Paul, Trench, Trübner, London 1899, Bd. 4, S. 306
    „The Pope said, " I am content."“
    Ludwig Pastor, The History of the Popes from the Close of the Middle Ages, Bd. 4, Bd. 4, S. 306. Original
  3. According to Pastor, Girolamo and Salviati then decided to act against the clearly expressed desire of the pope. Pastor writes that it is certain that Sixtus desired the Medici to be overthrown by force, and equally certain that he knew nothing of the details of the attempted assassination, because these were only arranged on the morning of the deed. Among the conspirators were also two clerics: Stefano da Bagnone, a dependent of Jacopo de’ Pazzi, and Antonio Maffei of Volterra.
    Evidence: hg. von Frederick Ignatius Antrobus, Kegan Paul, Trench, Trübner, London 1899, Bd. 4, S. 306
    „Girolamo and Salviati determined to act in opposition to the clearly expressed desire of the Pope.“
    Ludwig Pastor, The History of the Popes from the Close of the Middle Ages, Bd. 4, Bd. 4, S. 306. Original
    Evidence: hg. von Frederick Ignatius Antrobus, Kegan Paul, Trench, Trübner, London 1899, Bd. 4, S. 311
    „It is certain that he desired that the Medici should be overthrown by force. It is equally certain that he can have known nothing beforehand of the details of the attempted assassination“
    Ludwig Pastor, The History of the Popes from the Close of the Middle Ages, Bd. 4, Bd. 4, S. 311. Original
    Evidence: hg. von Frederick Ignatius Antrobus, Kegan Paul, Trench, Trübner, London 1899, Bd. 4, S. 307
    „and two clerics, Stefano of Bagnone, a dependent of Jacopo de' Pazzi, and Antonio Maffei of Volterra“
    Ludwig Pastor, The History of the Popes from the Close of the Middle Ages, Bd. 4, Bd. 4, S. 307. Original

What happened to those affected?

  1. Salviati's attempt to seize the government palace failed. The supporters of the Medici hanged Archbishop Salviati, his brother, his nephew and Francesco de’ Pazzi from the windows of the palace and tore the corpses to pieces. The two clerics who had attacked Lorenzo had their noses and ears cut off before they were killed. According to Pastor, uninvolved people were killed too, among them innocent clerics; Cardinal Raffaele Riario was imprisoned.
    Evidence: hg. von Frederick Ignatius Antrobus, Kegan Paul, Trench, Trübner, London 1899, Bd. 4, S. 310
    „Salviati's attempt to take possession of the Signorial Palace was equally a failure.“
    Ludwig Pastor, The History of the Popes from the Close of the Middle Ages, Bd. 4, Bd. 4, S. 310. Original
    Evidence: hg. von Frederick Ignatius Antrobus, Kegan Paul, Trench, Trübner, London 1899, Bd. 4, S. 311
    „Archbishop Salviati, his brother, and his nephew Jacopo Bracciolini, with Francesco de' Pazzi, were all hung up together from the window-bars of the Signorial Palace.“
    Ludwig Pastor, The History of the Popes from the Close of the Middle Ages, Bd. 4, Bd. 4, S. 311. Original
    Evidence: hg. von Frederick Ignatius Antrobus, Kegan Paul, Trench, Trübner, London 1899, Bd. 4, S. 311
    „The two assassins who had fallen upon Lorenzo had their noses and ears cut off before they were killed.“
    Ludwig Pastor, The History of the Popes from the Close of the Middle Ages, Bd. 4, Bd. 4, S. 311. Original
    Evidence: hg. von Frederick Ignatius Antrobus, Kegan Paul, Trench, Trübner, London 1899, Bd. 4, S. 314
    „Many ecclesiastics who had nothing to do with the conspiracy were also executed.“
    Ludwig Pastor, The History of the Popes from the Close of the Middle Ages, Bd. 4, Bd. 4, S. 314. Original
    Evidence: The Catholic Encyclopedia, Bd. 14 (1912), Artikel Pope Sixtus IV
    „because it rose in fury against the conspirators and brutal murderers of Giuliano de' Medici“
    Pope Sixtus IV, Artikel Pope Sixtus IV. Original · Archive copy

Background

Why? Justification and motives (according to the sources)

  1. According to the Britannica and the Catholic Encyclopedia, Sixtus IV heaped riches and offices on unworthy relations and made their aggrandisement the principal object of his policy as a secular prince. When he tried to erect a state on the frontiers of the Florentine republic for his nephews, he found a determined opponent in Lorenzo de’ Medici.
    Evidence: Encyclopædia Britannica, 11. Auflage (1911), Artikel Sixtus, Abschnitt Sixtus IV.
    „Not content with enriching them by gifts and lucrative offices, he made their aggrandizement the principal object of his policy as a secular prince.“
    Sixtus, Artikel Sixtus, Abschnitt Sixtus IV.. Original · Archive copy
    Evidence: The Catholic Encyclopedia, Bd. 14 (1912), Artikel Pope Sixtus IV
    „fell more and more under his dominating passion of nepotism, heaping riches and favours on his unworthy relations“
    Pope Sixtus IV, Artikel Pope Sixtus IV. Original · Archive copy
    Evidence: Encyclopædia Britannica, 11. Auflage (1911), Artikel Medici, Abschnitt Lorenzo
    „on endeavouring to erect a state on the frontiers of the Florentine republic for the benefit of his nephews, found a determined and successful opponent in Lorenzo“
    Medici, Artikel Medici, Abschnitt Lorenzo. Original · Archive copy

Response of the Church

  1. On 1 June 1478 Sixtus IV excommunicated Lorenzo and his adherents with the bull "Iniquitatis filius et perditionis alumnus" and threatened to lay Florence under interdict and cancel its archiepiscopal dignity if the guilty were not delivered up; among the charges were the execution of the archbishop and the clerics. According to the Catholic Encyclopedia, he placed Florence under interdict because the city had risen against the conspirators and murderers of Giuliano. Afterwards he waged a two-year war against Florence, which kept Italy in confusion from 1478 to 1480.
    Evidence: hg. von Frederick Ignatius Antrobus, Kegan Paul, Trench, Trübner, London 1899, Bd. 4, S. 316
    „he issued a Bull excommunicating Lorenzo and his adherents“
    Ludwig Pastor, The History of the Popes from the Close of the Middle Ages, Bd. 4, Bd. 4, S. 316. Original
    Evidence: hg. von Frederick Ignatius Antrobus, Kegan Paul, Trench, Trübner, London 1899, Bd. 4, S. 317
    „in the event of these guilty persons not being delivered up, the city would be laid under an Interdict and its Archiepiscopal dignity cancelled“
    Ludwig Pastor, The History of the Popes from the Close of the Middle Ages, Bd. 4, Bd. 4, S. 317. Original
    Evidence: hg. von Frederick Ignatius Antrobus, Kegan Paul, Trench, Trübner, London 1899, Bd. 4, S. 317, Anm.
    „Iniquitatis films et perditionis alumnus Laurentius de Medicis“
    Ludwig Pastor, The History of the Popes from the Close of the Middle Ages, Bd. 4, Bd. 4, S. 317, Anm.. Original
    Evidence: hg. von Frederick Ignatius Antrobus, Kegan Paul, Trench, Trübner, London 1899, Bd. 4, S. 316
    „They had hanged the Archbishop at the window of the Palace in the sight of the crowd“
    Ludwig Pastor, The History of the Popes from the Close of the Middle Ages, Bd. 4, Bd. 4, S. 316. Original
    Evidence: The Catholic Encyclopedia, Bd. 14 (1912), Artikel Pope Sixtus IV
    „even had Florence under interdict“
    Pope Sixtus IV, Artikel Pope Sixtus IV. Original · Archive copy
    Evidence: The Catholic Encyclopedia, Bd. 14 (1912), Artikel Pope Sixtus IV
    „He now entered upon a two years' war with Florence“
    Pope Sixtus IV, Artikel Pope Sixtus IV. Original · Archive copy
    Evidence: Encyclopædia Britannica, 11. Auflage (1911), Artikel Sixtus, Abschnitt Sixtus IV.
    „He entered into a fruitless and inglorious war with Florence, which kept Italy for two years (1478–80) in confusion.“
    Sixtus, Artikel Sixtus, Abschnitt Sixtus IV.. Original · Archive copy

See also

Scholarly literature and reference works

  1. Scholarly literature
    hg. von Frederick Ignatius Antrobus, Kegan Paul, Trench, Trübner, London 1899: Ludwig Pastor, The History of the Popes from the Close of the Middle Ages, Bd. 4, 1 January 1899. Original (retrieved 30 Oct 2026)
  2. Reference work
    The Catholic Encyclopedia, Bd. 14 (1912): Pope Sixtus IV, 1 January 1912. Original · Archive copy (retrieved 30 Oct 2026)
  3. Reference work
    Encyclopædia Britannica, 11. Auflage (1911): Sixtus, 1 January 1911. Original · Archive copy (retrieved 30 Oct 2026)
  4. Reference work
    Encyclopædia Britannica, 11. Auflage (1911): Medici, 1 January 1911. Original · Archive copy (retrieved 30 Oct 2026)
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