| Month: | February |
| Year: | 1878 |
| Dates: | 18–20 February 1878 |
| Location: | Sistine Chapel, Apostolic Palace, Rome |
| Dean: | Luigi Amat di San Filippo e Sorso |
| Subdean: | Camillo di Pietro |
| Camerlengo: | Gioacchino Pecci |
| Protopriest: | Josef Friedrich von Schwarzenberg |
| Protodeacon: | Prospero Caterini |
| Ballots: | 3 |
| Pope Elected: | Gioacchino Pecci |
| Nametaken: | Leo XIII |
| Prevconclave Year: | 1846 |
| Prevconclave Link: | 1846 papal conclave |
| Nextconclave Year: | 1903 |
| Nextconclave Link: | 1903 papal conclave |
The papal conclave held from 18 to 20 February 1878 saw the election of Vincenzo Pecci, who took the name Leo XIII as pope. Held after the death of Pius IX, who had had the longest pontificate since Saint Peter, it was the first election of a pope who would not rule the Papal States. It was the first to meet in the Apostolic Palace in the Vatican because the venue used earlier in the 19th century, the Quirinal Palace, was now the palace of the king of Italy, Umberto I.
When the cardinals assembled, they faced a dilemma. Should they choose a pope who would continue to espouse Pius IX's reactionary religious and political views, and would continue to refuse to accept Italy's Law of Guarantees guaranteeing the pope religious liberty in the Kingdom of Italy? Or should they turn away from the policies of Pius IX and choose a more liberal pope who could work for reconciliation with the king of Italy? Would choosing such a policy be seen as a betrayal of Pius IX, the self-proclaimed "prisoner in the Vatican"?
Other broader issues included Church-State relations in Italy, the Third French Republic, Ireland and the United States; the heresy Leo XIII later called Americanism; divisions in the Church caused by the proclamation of papal infallibility by the First Vatican Council; and the status of the First Vatican Council, which had been halted suddenly and never concluded. The length of Pius IX's reign suggested the cardinals give special consideration to the age and health of the man they elected.
Some 61 of 64 cardinals entered the conclave. Two others arrived too late from New York and Dublin to participate and one did not attend for health reasons. Three of the 61 had participated in the previous conclave in 1846: Luigi Amat di San Filippo e Sorso, Fabio Maria Asquini, and Domenico Carafa della Spina di Traetto.
With what many churchmen believed was the "unstable" and "anti-Catholic" situation in a Rome that was no longer controlled by the Church, some cardinals, notably Cardinal Manning, Archbishop of Westminster, urged that the conclave be moved outside Rome, perhaps even to Malta.[1] However the Camerlengo, Vincenzo Gioacchino Raffaele Luigi Pecci, advocated otherwise, and an initial vote among cardinals to move to Spain was overturned in a later vote. The conclave finally assembled in the Sistine Chapel in the Vatican on 18 February 1878.
Going into the conclave, Cardinal Pecci was the one candidate favored to be elected, in part because many of the cardinals who headed to Rome had already decided to elect him.[2] In addition to Pecci's competent administration as Camerlengo during the brief sede vacante period up to the conclave, Pecci was seen as the opposite of Pope Pius IX in terms of manner and temperament, and had also had a successful diplomatic career prior to being Archbishop-Bishop of Perugia.[2] Pecci's election was also facilitated in that Alessandro Franchi, the candidate favored by the conservatives, urged his supporters to switch their support to the Camerlengo.[2]
One account reported the voting tabulations without providing its source.[3]
On the first ballot, held on the morning of 19 February the votes were
This ballot was ruled invalid because at least one cardinal did not mark his ballot properly.[4]
The election of Cardinal Pecci, who took the name of Leo XIII, was a victory for the liberals. Pecci had been an effective bishop whose diocese had moved from the Papal States to the Kingdom of Italy successfully, without Church problems. He was seen as a diplomatic pragmatist with the tact and flexibility opponents of the previous pope believed Pius IX lacked. At 68 Leo was also young enough to do the job without hindrance of health problems, but old enough to offer the prospect of a relatively short reign of ten to fifteen years. Whereas Pius IX was seen as having isolated the Church from international opinion (his confining Jews in ghettos and his treatment of minorities had been condemned by world leaders such as Gladstone), Leo was seen as an "internationalist" who could earn back the Vatican some international respect.
Though always seemingly in poor health and delicate condition, Leo reigned for 25 years. He had the third longest reign of any pope until that time. When he died on 20 July 1903 at the age of 93 he had lived to be older than any of his known predecessors.
| LENGTH OF CONCLAVE | 2 days | |
|---|---|---|
| NUMBER OF BALLOTS | 3 | |
| ELECTORS | 64 | |
| Absent | 3 | |
| Present | 61 | |
| Africa | 0 | |
| Latin America | 0 | |
| North America | 0 | |
| Asia | 0 | |
| Europe | 61 | |
| Oceania | 0 | |
| Mid-East | 0 | |
| Italians | 40 | |
| VETO USED? | No | |
| DECEASED POPE | PIUS IX (1846–1878) | |
| NEW POPE | LEO XIII (1878–1903) |