Early in 1477, Francesco de' Pazzi, manager in Rome of the Pazzi bank, plotted with Girolamo Riario, nephew and "protégé" of the pope, Sixtus IV, and with Francesco Salviati, whom Sixtus had made archbishop of Pisa, to assassinate Lorenzo de' Medici and his brother Giuliano to oust the Medici family as rulers of Florence. Sixtus gave tacit support to the conspirators. The assassination attempt was made during mass in the Florence Cathedral on 26 April 1478. Giuliano was killed; Lorenzo was wounded but escaped. Salviati, with mercenaries from Perugia, tried but failed to take over the Palazzo della Signoria. Most of the conspirators were soon caught and summarily executed; five, including Francesco de' Pazzi, were hanged from the windows of the Palazzo della Signoria. Jacopo de' Pazzi, head of the family, escaped from Florence but was caught and brought back. He was tortured, then hanged from the Palazzo della Signoria next to the decomposing corpse of Salviati. He was buried at Santa Croce, but the body was dug up and thrown into a ditch. It was then dragged through the streets and propped up at the door of Palazzo Pazzi, where the rotting head was mockingly used as a door-knocker. From there it was thrown into the Arno; children fished it out and hung it from a willow tree, flogged it, and then threw it back into the river.