He is remembered principally for his participation in the
Pazzi Conspiracy, a plot by the
Pazzi and
Salviati families to assassinate
Lorenzo de' Medici and his younger brother
Giuliano. The attempt took place during
High Mass in the
Duomo of Florence on
Easter Sunday, 26 April 1478. Giuliano was stabbed to death by Baroncelli and
Franceso de' Pazzi, but Lorenzo was only wounded by the other conspirators and managed to escape; Baroncelli also killed a Medici retainer,
Francesco Nori. After the failure of the plot, Baroncelli fled Italy, but was eventually found and arrested in
Constantinople. Antonio Medici was sent to bring him from Constantinople back to Florence, where Baroncelli, still wearing his Turkish robes, was ultimately hanged on 29 December 1479 at the
Palazzo del Bargello. Baroncelli's execution was depicted in a macabre sketch drawn by
Leonardo da Vinci while he was in Florence in 1479. Da Vinci even noted the colors of the robes that Baroncelli was wearing at the time of his death in his typical
mirror writing. == In culture ==