The two lateral paintings were commissioned in September 1600 by Monsignor
Tiberio Cerasi, Treasurer-General to
Pope Clement VIII, who purchased the chapel from the
Augustinian friars on 8 July 1600 and commissioned
Carlo Maderno to rebuild the small edifice in
Baroque style. The contract for the
altarpiece with Carracci has not been preserved but it is generally assumed that the document had been signed somewhat earlier, and Caravaggio had to take into consideration the other artist's work and the overall iconographic programme of the chapel. Cerasi nourished a deep devotion towards
Saint Peter and
Paul, and invoked them in his will. Together the two saints represented the foundation of the Catholic Church, and they were called the Princes of the Apostles. Both had a strong connection to the city of Rome and the papacy. Caravaggio's paintings were thus intended to express Cerasi's attachment to the
Church of Rome and his closeness to papal power. Their position in the chapel was important but the devotional focus was still on the
Assumption of the Virgin Mary on the altar in the middle. The juxtaposition of the two scenes had a well-known precedent in the frescos of the
Capella Paolina at the
Apostolic Palace (1542–1549) but the paintings of Caravaggio were starkly different from the crowded
Mannerist scenes of
Michelangelo. Although much has been said about the supposed rivalry between Carracci and Caravaggio, there is no historical evidence about any serious tensions. Both were successful and sought-after artists in Rome. Caravaggio gained the Cerasi commission right after his celebrated works in the
Contarelli Chapel had been finished, and Carracci was busy creating his
great fresco cycle in the
Palazzo Farnese. In these circumstances there was little reason for them to regard each other as business rivals, states
Denis Mahon. The contract signed on 24 September 1600 stipulates that "the distinguished painter, Michelangelo Merisi da Caravaggio" will paint two large
cypress panels, ten palms high and eight palms wide, representing the conversion of Saint Paul and the martyrdom of Saint Peter within eight months for the price of 400
scudi. The contract gave a free hand to the painter to choose the figures, persons and ornaments depicted in the way as he saw fit, "to the satisfaction however of his Lordship", and he was also obliged to submit preparatory studies before the execution of the paintings. Caravaggio received 50 scudi as advance payment from the banker
Vincenzo Giustiniani with the rest earmarked to be paid on completion. The dimensions specified for the panels are virtually the same as the size of the existing canvasses. When Tiberio Cerasi died on 3 May 1601, Caravaggio was still working on the paintings, as attested by an
avviso dated 5 May which mentioned that the chapel was being decorated by the hand of the "famosissimo Pittore", Michelangelo da Caravaggio. A second
avviso dated 2 June proves that Caravaggio was still at work on the paintings a month later. He completed them sometime before 10 November when he received the final instalment from the heirs of Tiberio Cerasi, the Fathers of the Ospedale della Consolazione. The total compensation for the paintings was reduced to 300 scudi for unknown reasons. The paintings were finally installed in the chapel on 1 May 1605 by the woodworker Bartolomeo who received four scudi and fifty baiocchi from the Ospedale for his work.
The first version Giovanni Baglione in his 1642 biography about Caravaggio reported that the first versions of both paintings were rejected: "The panels at first had been painted in a different style, but because they did not please the patron, Cardinal Sannesio took them; in their place he painted the two oil paintings that can be seen there today, since he did not use any other medium. And – so to speak – Fortune and Fame carried him along." This report is the only historical source for the well-known story. Although the biography was written decades after the events, its veracity has generally been accepted. Baglione provided no further explanation about the reasons and circumstances of the rejection but modern scholarship put forward several theories and conjectures. The first versions of the paintings were obviously acquired by
Giacomo Sannesio, secretary of the
Sacra Consulta and an avid collector of art. Caravaggio's biographer,
Giulio Mancini mentioned these paintings being in the collection of Cardinal Sannesio around 1620 but he thought them retouched copies of the originals. The paintings reappeared in an inventory of Francesco Sannesio, Cardinal Giacomo's heir, dated to 19 February 1644 that recorded "two large panels, that represent Saint Peter crucified and the other the conversion of Saint Paul, framed in gold". This time the heirs sold the paintings to the Spanish
Viceroy of Naples,
Juan Alfonso Enríquez de Cabrera who transported them to
Madrid two years later. After his death, the paintings were recorded again in the inventory of his assets on 7 August 1647. At the time "The Martyrdom of Saint Peter" was valued to a total of 3300 ducats, its gilded and carved frame estimated to have a value of 300 ducats in itself. The panel was registered for the last time in the inventory of the possessions of Juan Gaspar Enríquez de Cabrera, the tenth
Admiral of Castile, in 1691. After that the first version of the
Crucifixion of Peter has disappeared from the documents, and its further fate remains unknown. The painting of this subject in the
Museo del Patriarca in Valencia is attributed to Caravaggio and may be the first version. ==Description==