The papal nobility is the nobility of the Holy See. Few pontifical titles, other than personal nobility granted by individual entry into the several pontifical equestrian orders, have been granted since the election of Pope John XXIII, though Pope John Paul II ennobled several distinguished individuals during his pontificate, as did Pope Benedict XVI, through the Vatican Secretariat of State. Those granted included prince, duke, count, marquis, and baron. The papal nobility are, as such, part of the Papal Court reformed via the 1968 apostolic letter Pontificalis Domus, which reorganized the Court into the Pontifical Household. Papal titles of nobility were specifically recognized by Italy in the 1929 Lateran Treaty establishing the Vatican City State and recognizing the sovereignty of the Holy See. In 1969 the Italian Council of State determined that the provision of the Lateran Treaty concerning the recognition of papal titles that was incorporated into the Italian Constitution was still valid and therefore that their use in Italy was still licit. No provision, however, has been made for their use in Italian passports, identity cards or civil state registries.
The Papal States under the temporal jurisdiction of the Pope had a territorial nobility, allied and intermarried with the nobility of other Italian states. During this period, throughout Italy, various influential families came to positions of power through the election to the papacy of a family member or were elevated into the ranks of nobility through ecclesiastic promotion. These families freely intermarried with aristocratic nobility. Like other noble families, those with both papal power and money were able to purchase comunes or other tracts of land and elevate family patriarchs and other relatives to noble titles. Hereditary patriarchs were appointed Duke, Marquis and even Prince of various 16th- and 17th-century principalities. According to Ranke: