1829 papal conclave

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Papal conclave
February–March 1829
Dates and location
24 February – 31 March 1829
Quirinal Palace, Papal States
Key officials
DeanGiulio Maria della Somaglia
Sub-deanBartolomeo Pacca
CamerlengoPietro Francesco Galleffi
ProtopriestGiuseppe Firrao
ProtodeaconGiuseppe Albani
CandidatesEmmanuele de Gregorio, Bartolomeo Pacca
VetoedBartolomeo Pacca
Elected pope
Francesco Saverio Castiglioni
Name taken: Pius VIII
Ritratto di Papa Pio VIII, by Clemente Alberi.jpg
← 1823

The 1829 papal conclave to elect a successor to Pope Leo XII after his death on 10 February 1829 began on 24 February 1829.

It took a long time for the conclave to elect a new pope due to conflict between secular governments concerning who should be elected. Cardinal Emmanuele De Gregorio was the proposed candidate of the pro-French faction and the zelanti (conservative cardinals), whilst Bartolomeo Pacca was proposed by the more moderate cardinals but was not accepted by the French government of the Bourbon Restoration period. At the time, France was governed by Charles X and Prime Minister Jean Baptiste Gay, vicomte de Martignac. Pacca was also seen by many in the conclave as being too gentle to be an effective Pope.


The conclave did not move rapidly. The arrival of Giuseppe Albani caused the votes to center on Francesco Saverio Castiglioni. With the supporters of both De Gregorio and of Pacca unable to secure enough votes to elect their candidate to the papacy, Castiglioni came to be seen as a suitable compromise candidate. Castiglioni had been close to election in the 1823 conclave as the representative of the politicanti (moderate cardinals) and had all the qualifications to become Pope, though he had the problem of being in very poor health, but was not elected at the last conclave when the zelanti Cardinals came to realize that he was quite close to Cardinal Ercole Consalvi.[1][2] Consalvi however was already dead by the time of the 1829 conclave having died during the pontificate of Pope Leo XII.

On 31 March Castiglioni was elected Pope. Given that Castiglioni had been called Pius VIII by Pope Pius VII even before his death in 1823,[1][2] and that in the 1823 conclave Leo XII had said that Castiglioni "some day was to be Pius VIII", it was a foregone conclusion that he would take that regnal name upon becoming Pope.

Duration 35 days
Electors 50
Veto used against Bartolomeo Pacca
by Charles X of France.
NEW POPE PIUS VIII (1829–1830)


  1. ^ a b Valérie Pirie. "The Triple Crown: An Account of the Papal Conclaves - Leo XII (De la Genga)".
  2. ^ a b Valérie Pirie. "The Triple Crown: An Account of the Papal Conclaves - Pius VIII (Castiglione)".