The Princes Assistant to the Pontifical Throne are hereditary offices of the Roman Curia. They date from the early sixteenth century and survived the reform of the Prefecture of the Pontifical Household in 1968. They are the only hereditary posts still in use at the Vatican.
The title is held by:
The head of the Colonna family has been one of the Princes Assistant since 1710. The head of the Orsini family was one of the Princes Assistant from 1735 to 1958 when Pope Pius XII removed the title from Prince Filippo Orsini who was having an affair with the actress Belinda Lee and then slashed his wrists.Pope Pius XII then appointed the head of the Torlonia family as the second Prince Assistant.