Before the motu proprio Pontificalis Domus of 28 March 1968, Honorary Prelates (HP) were called Domestic Prelates (Latin: Antistites Urbani). Those who held certain offices were also granted the title, such as an Archbishop or Bishop Assistant at the Pontifical Throne or a member of the Roman Prelature. The title was retained by archbishops, bishops and protonotaries apostolic who had been awarded it before their appointment to those positions.
The Prelates of Honor are entitled Reverendo Monsignore (Italian) or Reverendus Monsignor (Latin) (English: Reverend Monsignor).
Prelates of Honor:
Prelates of Honor durante munere: