Guicciardini, an Italian statesman and historian, born in Florence; studied law; became professor of Jurisprudence there; was a disciple of Macchiavelli; did service as a statesman in the Papal territories; took a leading part in the political changes of Florence; secured the restoration of the Medici to power, and on his retirement composed a "History of Italy during his Own Time," which he had all but completed when he died (1485-1540).