There was at one period not a little divergence of opinion about the precedence of cardinals over bishops; but the matter has long ago been irrevocably settled. A cardinal, indeed, cannot, unless invested with the episcopal character, perform any act that depends for its validity upon such a character, nor can he lawfully invade the jurisdiction of a bishop; but apart from this his rank in the church is always, everywhere, and under all circumstances superior to that of any bishop, archbishop, metropolitan, primate, or patriarch. Nor can it be said that this is an anomaly, unless we are also prepared to condemn other decisions of the church; for the precedence of cardinals over bishops has a certain parity with that of the archdeacons in old times over priests, which very example is brought forward by Eugene IV. in 1431 to convince Henry, Archbishop of Canterbury, who had a falling out with Cardinal John of Santa Balbina: “Quoniam in hujusmodi prælationibus officium ac dignitas, sive jurisdictio, præponderat ordini, quemadmodum jure cautum est ut archidiaconus, non presbyter suæ jurisdictionis obtentu, archipresbytero præferatur” (Bullarium Romanum, tom. iii.) But we could bring a more cogent example from the modern discipline of the church. A vicar-general, although only tonsured, outranks (within the diocese) all others, because, as canonists say, unam personam cum episcopo gerit; with as much justice, therefore, a cardinal, who is a member of the pope, whose diocese is the world, precedes all others (we speak of ecclesiastical rank) within mundane limits. There is one example, particularly, in ecclesiastical history that shows us how important was the influence of the Roman cardinals in the whole church, and how great was the deference paid to them by bishops. After the death of S. Fabian, in the year 250, the priests and deacons—cardinals—of Rome governed the church for a year during the vacancy of the see, and meanwhile wrote to S. Cyprian, bishop, and to the clergy of Carthage, in a manner that could only become a superior authority, as to how those should be treated who, having lapsed from the faith during the persecution, now sought to be reconciled. The holy bishop answered respectfully in an epistle (xxth edition, Lipsiæ, 1838), in which he gave them an account of his gests and government of the diocese. Pope Cornelius testifies that the letters of the cardinals were sent to all parts to be communicated to the bishops and churches (Coustant, Ep. RR. PP. x. 5). It is also very noteworthy that in the General Council of Ephesus, in 431, of Pope Celestine’s three legates, the cardinal-priest preceded the two others, although bishops, and before them signed the acts. Those who say the Breviary according to the Roman calendar are familiar with the fact that at an indefinitely early age the cardinals were created (just as now) before the bishops of various dioceses were named, hence those familiar words: “Mense decembri creavit presbyteros (tot), diaconos (tot), episcopos per diversa loca (tot).”

The importance of a cardinal a thousand years ago can be imagined from the fact recorded by Muratori (Annali d’Italia, tom. v. part. i. pag. 55), that when Anastasius had absented himself from his title for five years without leave, and was residing in Lombardy, three bishops went from Rome to invite him back, and the emperors Louis and Lothaire also interposed their good offices.

Although all cardinals are equal among themselves in the principal things, yet in many points of costume, privilege, local office, and rank there are distinctions and differences established by law or custom, the most important of which follow from the division of the cardinals into three grades, namely, of bishops, priests, and deacons. Although the whole number of suburbicarian sees, of titles, and deaconries amounts to seventy-two (six for the first, fifty for the second, and sixteen for the third class), the membership of the Sacred College is limited since Sixtus V. to the maximum of seventy. There can be no doubt that the episcopal sees lying nearest to, and, so to speak, at, the very gates of Rome, have enjoyed from the remotest antiquity some special pre-eminence; but it is not easy to determine at what epoch their incumbents began to form a part of the body of cardinals. It is certain only that they belonged to it in the year 769. These suburban sees all received the faith from S. Peter himself; and the tradition of Albano is that S. Clement, who was afterwards pope, had been consecrated by the apostle and sent there as his coadjutor and auxiliary. The number of these sees was formerly seven, but for a long time has been only six. The Bishop of Ostia and Velletri is the first of this order and Dean of the Sacred College. He has the privilege of consecrating the pope, should he be only in priest’s orders when elected, and of wearing the pallium on the occasion.

The titles of the cardinal-priests are fifty, some being held by persons who have been consecrated bishops but have no diocese, or by jurisdictional bishops—i.e., those who are at the head of dioceses and archdioceses. The most illustrious, though not the oldest, of these is S. Lawrence in Lucina, which is called the first title, and gives its cardinal precedence—other things being equal—in his class.

In the life of S. Fabian, who reigned in the year 238, we read that he gave the districts of Rome in charge to the deacons: “Hic regiones divisit diaconibus”; and these are supposed to have been the first cardinal-deacons, or regionary cardinals, as they were long called. This order is third in rank, but second in point of time when it was admitted into the Sacred College. The number of cardinal-deacons became fourteen (one for each of the civil divisions of the city) towards the end of the VIth century, under the pontificate of S. Gregory the Great. In the year 735 Pope Gregory III. added four and raised the number to eighteen, which was reduced under Honorius II., in the beginning of the XIIth century, to sixteen. After various other mutations of number it was fixed as at present. Until the pontificate of Urban II. in 1088 these cardinals were denominated by the name of their district or region, except those added by Gregory III., who were called palatines. After the XIth century they were called from the name of their deaconries. S. Mary in Via Lata is the first deaconry. The cardinal-deacons are often in priests’ orders; but in this case they cannot celebrate Mass in public without a dispensation from the Pope, but they can say it in their private chapel in presence of their chaplain. In early times cardinal-deacons held a position of very singular importance, and the pope was frequently chosen from their restricted class. Even now some of the highest positions at Rome are occupied by them.

Although a cardinal is created either a cardinal-priest or a cardinal-deacon, there is a mode of advancement even to the chief suburbicarian see. This is called, in the language of the Curia, option, or the expressing a wish to pass from one order to a higher, or from one deaconry, title, or see to another. The custom is comparatively recent, and was looked upon at first with considerable disfavor. It owes its origin to the schism which Alexander V. attempted to heal in 1409 by forming one body of his own (the legitimate) and of the pseudo-cardinals of the anti-pope Benedict XIII. As there were two claimants to the several deaconries, titles, and sees, he proposed to settle the dispute by permitting one of them in succession to optate to the first vacant place in his order. What was meant as a temporary measure became an established custom under Sixtus IV. (1471-1484). If a cardinal-bishop be too infirm to perform episcopal duties in the see which he already fills, Urban VIII. decreed that he cannot pass to another one. If a cardinal-deacon obtain by option a title before he has been ten years in his own order, he must take the lowest place among the priests; but if after that period, he takes precedence of all who have been created in either of the two orders since his elevation. The favor of option is asked of the pope in the consistory held next after a vacancy has occurred, by the cardinal proposing such a change. The prefect of pontifical ceremonies having previously assured himself that no cardinal outranking the postulant contemplates the same, the cardinal-priest, to give an example from this order, rises and says: “Beatissime Pater, si sanctitati vestræ placuerit dimisso titulo N. transitu ex ordine presbyterali ad episcopalem, opto ecclesiam N.,” naming his title and the suburbicarian see that he seeks to occupy.

These three orders of cardinals certainly had a corporate character at an early period, and formed what the ancients called a college with its officers and by-laws; but Arnulf, Bishop of Lisieux in the Xth century, was the first to call them collectively Collegium Sanctorum; hence in all languages it is now called the Sacred College. A proof that the cardinals acted together in a public capacity, and of their exalted dignity, is that they are termed Proceres clericorum by Anastasius in the Life of S. Leo III. In olden times cardinals were strictly obliged to reside near the pope; and a Roman council, composed of sixty-seven bishops, held in 853 under S. Leo IV., called in judgment and deposed the cardinal-priest of S. Marcellus for having contumaciously absented himself during a long time from his title. This obligation of residence in the house or palace annexed to the title or the deaconry was somewhat relaxed in the XIIth century, when bishops of actual jurisdiction began to be created cardinals. The first example of a bishop governing a diocese who was made a cardinal is that of Conrad von Wittelsbach, of the since royal house of Bavaria, Archbishop of Mentz, who was raised to this dignity by Alexander III. in 1163.

Innocent III., however, refused a petition of the good people of Ravenna to let them have a certain cardinal for their archbishop, saying that he was more useful to Rome and to the church at large where he was than he could possibly be in any other position. At this period, and until a considerable time after, it was very rare that a bishop was made a cardinal without having to resign his diocese and reside in curia.

Leo X. was so strict in his ideas of the duty of cardinals to live near him that he issued a bull renewing the obligation in very strong terms; and in 1538 it was proposed to Paul III. to draw up a plan of reform making it incompatible to govern a diocese and be at the same time a cardinal, except in the case of the Fathers of the First Order, who, from the nearness of their sees to Rome, could perform their service to the pope as his councillors and assistants, and not neglect the faithful over whom they were placed (Natalis Alexander, Hist. Eccl., tom. xvii. art. 16). No such stringent rule was adopted, and a cardinal might be this and govern a diocese, if he made it his place of habitual residence, according to the decree of the Council of Trent (Session xxiii., on Ref., ch. 1).