Giovanni Giangaetano Orsini
Giovanni Orsini, called Giangaetano, was a Roman baron and lord of Vicovaro, son of Orso di Bobone. By Stefania Rubea he fathered Matteo Rosso Orsini the Great (1178–1246), senator of Rome, whose son became Pope Nicholas III. His will is dated 12 April 1232.