April Blood

In April 1478, a plot to murder the two heads of the powerful Medici family dramatically miscarried. The younger of the two brothers was killed, but Lorenzo the Magnificent, the brilliant poet and connoisseur escaped. A bloodbath followed and all of Italy was at once affected as it emerged that the Pope, the King of Naples, and the Duke of Urbino were deeply implicated in the plot, and that binding treaties required Milan and Venice to assist Florence.
If the conspirators had succeeded and Lorenzo had been killed the future of the Medici family and, indeed, of the Florentine state would have been utterly transformed.