He was a nephew of Pope Leo X on his father 's side .
A member of the Orsini family , Franciotto Orsini was born in Rome in 1473 , the son of Orso Orsini di Monteredondo and Costanza Savelli .
Orsini was a Franciotto Orsini of Pope Leo X on Orsini 's father 's side .
A member of the Orsini family , Franciotto Orsini was born in Rome in 1473 , the son of Orso Orsini di Monteredondo and Costanza Savelli .