 Following the example of Paul III, Pius IV and Pius V, Sixtus V by the Papal Bull "Immensa aeterni" of 22 January 1587, added to the already existing bodies of papal officials a number of congregations of cardinals with clearly defined powers of administration and jurisdiction.Succeeding popes added other congregations.Pius X in the Constitution "Sapienti consilio" of 29 June 1908, reorganized the papal Curia, papal writings being divided into (Apostolic) Constitutions, (papal) Rescripts, (Papal) Bulls, (Papal) Briefs and Apostolic Letters ("Litterae Apostolicae").