Jus exclusivae

Pope Pius IV, in his bull In Elgidendis (1562), excluded formal support of the Church to such rights and external interventions in the conclave.

The bull Aeterni Patris Filius by Pope Gregory XV (15 November 1621) forbids cardinals to conspire to exclude any candidate.

In the apostolic constitution In hac sublimi of 23 August 1871 Pope Pius IX forbade any kind of secular interference in papal elections.

The following year, Pius X forbade the jus exclusivae in the apostolic constitution Commissum Nobis of 20 January 1904: Wherefore in virtue of holy obedience, under threat of the Divine judgment, and pain of excommunication latae sententiae… we prohibit the cardinals of the Holy Roman Church, all and single, and likewise the Secretary of the Sacred College of Cardinals, and all others who take part in the conclave, to receive even under the form of a simple desire the office of proposing the veto in whatever manner, either by writing or by word of mouth… And it is our will that this prohibition be extended… to all intercessions, etc… by which the lay powers endeavour to intrude themselves in the election of a pontiff… Let no man infringe this our inhibition… under pain of incurring the indignation of God Almighty and of his Apostles, Sts.

During the 1963 conclave, Generalissimo Francisco Franco made an unsuccessful attempt to block the election of Cardinal Giovanni Battista Montini.