Lorenzo's brother Guiliano is shown as being in his late teens to early 20s at the time of the supposed attempt on Piero's life. In fact he was 13 at the time of the aborted attempt to overthrow the Medici in 1466 and had nothing to do with it.
Lorenzo took control of the Medici bank and of the Florence Republic only upon the passing of his father Piero.
Piero Medici died on December 2, 1469 in bed from complications of gout. He had never been injured in an assassination attempt.