High Quality Content by WIKIPEDIA articles! According to their family legend, the Orsini are descended from the Julio-Claudian family of ancient Rome. This is fanciful, as is the alleged connection to the German families of Anhalt, Baden and Bohemian Rosenberg sporting the same name. The Orsini also carried on a political feud with the Colonna family until by Papal Bull it was stopped in 1511; in 1571 the Chiefs of both families married the nieces of Pope Sixtus V. The Orsini were related to the Boboni family existing in Rome in the 11th century. The first members always used the surname of Boboni-Orsini. The first known family member is one Bobone, in the early 11th century, father of Pietro, in turn father of Giacinto dei Boboni (1110 1198), who in 1191 became pope as Celestine III. One of the first great nepotist popes, he made two of his nephews cardinals and allowed his cousin Giovanni Gaetano (Giangaetano, died 1232) to buy the fiefs of Vicovaro, Licenza, Roccagiovine and Nettuno, which formed the nucleus of the future territorial power of the family.