In case you doubted that the Medicis were pretty important people, they owned their own church and none other than Michelangelo made statues for their tombs. How's that for name-dropping? Check out Lorenzo's tomb.
More name dropping ahoy! Cesare Borgia hired Leonardo da Vinci as his architect and engineer for about a year. We guess he was too expensive to keep. That, or his little problem of never finishing anything he started. (Machiavelli, Niccolò, and Tim Parks. The Prince. New York: Penguin, 2009.)
Machiavelli was a total perv and spent most of his free time when he wasn't writing visiting prostitutes. He was married, by the way. (Source.)
Tupac Shakur apparently was a big fan of Machiavelli and actually recorded some raps under the name Makaveli. Some people think this means that Tupac is still alive, since the name is an anagram of "K, am Alive." Yikes. (Source.)