The word
cardinal is derived from the Latin
cardō, meaning "hinge". The office of cardinal as it is known today slowly evolved during the first millennium from the clergy of Rome. "The first time that the term
cardinal appears in the
Liber Pontificalis is in the biography of
Pope Stephen III when in the Roman Synod of 769, it was decided that the Roman pontiff should be elected from among the deacons and cardinal priests." During the pontificate of
Pope Stephen V (816–817), the three classes of the college that are present today began to form. Stephen V decreed that all cardinal bishops were bound to sing Mass on rotation at the high altar at
St. Peter's Basilica, one per Sunday. The first class to form were the cardinal deacons, direct theological descendants of the original seven ordained in
Acts 6, followed by the cardinal priests, and then the cardinal bishops. At the same time, the popes began referring to the cardinal priests of Rome to serve as legates and delegates within Rome at ceremonies, synods, councils, etc., as well as abroad on diplomatic missions and councils. Those who were assigned to the latter roles were given the titles of (Cardinal Legate) and (Special Missions). The college played an integral part in various reforms within the Church as well, as early as the pontificate of
Pope Leo IX (1050). The College of Cardinals was empowered to elect Popes by
Pope Nicholas II through his 1059
papal bull In Nomine Domini, which was the culmination of the
Gregorian Reforms, that arose after a prolonged period of interference by local aristocrats and the Holy Roman Emperor in papal selection process which saw increased amounts of clerical abuse (See
Saeculum obscurum). In the 12th century, the
Third Council of the Lateran declared that only cardinals could assume the papacy, a requirement that has since lapsed. By the end of the 14th century, the practice of having solely Italian cardinals had ceased. Between the 14th and 17th centuries, there was much struggle for the college between the cardinals and the reigning popes. Although some popes increased the number of cardinals in order to guarantee allies,
Pope Benedict XII often refused to do so, and created six new cardinals on only one occasion, in 1338. The
Council of Basel (1431–1437), later transferred to Ferrara and then Florence, limited the size of the college to 24, The capitulations of the 1484 (
Pope Innocent VIII) and 1513 (
Pope Leo X) conclaves contained the same restriction. The capitulation of the
1492 papal conclave also contained a restriction on the creation of new cardinals. The
Fifth Council of the Lateran (1512–1517), despite its detailed regulation of the lives of cardinals, did not consider the size of the college. In 1517,
Pope Leo X added another 31 cardinals, bringing the total to 65, so that he could have a supportive majority in the College of Cardinals.
Pope Paul IV brought the total to 70. His immediate successor,
Pope Pius IV (1559–1565), raised the limit to 76.
Ferdinand I, Holy Roman Emperor sought a limit of 26 and complained about the size and quality of the college to his legates to the
Council of Trent, and some French attendees advocated a limit of 24, but the council did not prescribe a limit to the size of the college.
Pope Paul VI continued this expansion, reaching 134 at
his third consistory in April 1969. In the 19th and 20th centuries, the College of Cardinals
internationalized.
Number of electors The total size of the college lost its significance when Paul VI decided to allow only cardinals under the age of 80 to vote in a
conclave from 1971 onward. In 1975, Paul VI set the maximum number of those under 80, the cardinal electors, at 120. His next consistory in 1976 brought the number of cardinal electors to its full complement of 120. All of Paul VI's successors have at times exceeded the 120 maximum, except for
Pope John Paul I, who did not hold any consistories during his very short pontificate.
Pope John Paul II reiterated the 120 maximum in 1996, yet his appointments to the college resulted in more than 120 cardinal electors in four of
his nine consistories, reaching a high of 135 in February 2001 and again in October 2003. Three of
Pope Benedict XVI's
five consistories resulted in more than 120 cardinal electors, the high being 125 in 2012.
Pope Francis exceeded the limit in
all 10 of his consistories, reaching as high as 140 in December 2024.
Orders Other changes to the college in the 20th century affected specific orders. The
1917 Code of Canon Law decreed that, from then on, only those who were priests or bishops could be chosen as cardinals, thus officially closing the historical period in which some cardinals could be clergy who had only received first
tonsure and
minor order, or the
major orders of
deacon and
subdeacon, without a further ordination to the priesthood. In 1961, Pope John XXIII reserved to the pope the right to assign any member of the college to one of the suburbicarian sees and the rank of cardinal bishop. Previously only the senior cardinal priest and the senior cardinal deacon had the privilege of requesting such an appointment (
jus optionis) when a vacancy occurred. In 1962, he established that all cardinals should be bishops, ending the identification of the order of cardinal deacon with cardinals who were not bishops. He consecrated the twelve non-bishop members of the college himself. In February 1965, Pope Paul VI decided that an
Eastern Rite Patriarch who is created a cardinal would no longer be assigned a titular church in Rome, but maintain his see and join the order of cardinal bishops, the rank previously reserved to the six cardinals assigned to the
suburbicarian dioceses. He also required that the suburbicarian bishops elect one of themselves as the
dean and vice-dean of the college, instead of allowing them to select any member of the college.
Other modifications Pope Francis adjusted the rules regarding the dean in December 2019, so he now serves for a term of five years, which can be renewed by the pope. No change was made regarding the vice-dean. The resignation or removal of members has been a relatively rare phenomenon. Between 1791 and 2018, only one was removed from the college
Étienne Charles de Loménie de Brienne in 1791 and five resigned: Tommaso Antici in 1798, Marino Carafa di Belvedere in 1807,
Carlo Odescalchi in 1838,
Louis Billot in 1927, and
Theodore Edgar McCarrick in 2018.
Historical data For the
Middle Ages, sources concerning the size of the College of Cardinals are most frequently those relating to
papal elections and conclaves. ==Functions==