cortegiania:

The Pazzi conspiracy in 1478 came as a rude shock to a carefree city. The Pazzi bank, in the course of a treacherous war in which the adversaries did not scruple to use the most devious methods, had taken the business affairs of the papacy away from the Medici. Sixtus IV, his nephew Riario, and Francesco Salviati, the archbishop of Pisa, supported the Pazzi and in the end formed a conspiracy with them. They decided to assassinate Lorenzo and Giuliano in the cathedral during Easter mass on April 26, while the archbishop was to take over the signoria (the council of government). Giuliano was indeed killed in front of the altar, but Lorenzo succeeded in taking refuge in a sacristy. [X]

cortegiania:

Some sense of the shock Lorenzo felt at the death of his beloved brother can be gleaned by an uncharacteristic five-day gap in his correspondence. The heading over two blank pages in his secretary’s ledger reads, “Here and on the following page must be recorded the letters written about the tumult, when Giuliano de’ Medici was killed in Santa Reparata, may God have mercy on his soul.” The fact that they remained empty speaks volumes about Lorenzo’s state of mind. – Miles J. Unger