On Saturday, Dec. 7, Pope Francis will create 21 new cardinals at a consistory in Rome, including the archbishops of Tehran, Iran; Tokyo; and Toronto.

Here’s everything you need to know:

What is a consistory?

Cardinals are the pope’s closest assistants and advisers from all around the world. A consistory is a formal meeting of the College of Cardinals. The pope can convene them for a number of reasons.

One of the most common reasons for a consistory, as is the case here, is to create new cardinals. The ceremony in which the pope makes cardinals is known as an ordinary public consistory. 

Another consistory the pope may convene is an ordinary consistory to vote on the causes of new saints, the last step before a formal canonization can take place.

There are also extraordinary consistories, in which every cardinal is expected to take part, barring a serious reason.

The last ordinary public consistory to create new cardinals took place on Sept. 30, 2023. The new cardinals included Cardinal Pierbattista Pizzaballa, the Latin patriarch of Jerusalem; Cardinal Stephen Chow of Hong Kong; and Cardinal Victor Manuel Fernández, the prefect of the Dicastery for the Doctrine of the Faith.

Who is being made cardinal this weekend?

Twenty-one men from around the world will “receive the red hat” and become cardinals at the consistory this month.

Among them is Archbishop Frank Leo, metropolitan archbishop of Toronto in Canada; Archbishop Tarcisius Isao Kikuchi, SVD, metropolitan archbishop of Tokyo in Japan; Archbishop Dominique Joseph Mathieu, OFM Conv, archbishop of Tehran-Ispahan, a Belgian missionary bishop in Iran; Father Fabio Baggio, CS, undersecretary for the Migrants and Refugees Section of the Dicastery for the Promotion of Integral Human Development (from Italy); Father Timothy Radcliffe, OP, a theologian from the United Kingdom; and Archbishop Domenico Battaglia of Naples, Italy.

A list along with an analysis of each cardinal-elect’s spiritual motto and coat of arms can be found here.

What will actually happen at this consistory?

In addition to giving each new cardinal their hat, or biretta, Pope Francis at the Dec. 7 liturgy at St. Peter’s Basilica will place a ring on the hand of each new cardinal while saying: “Receive this ring from the hand of Peter and know that, with the love of the prince of the apostles, your love for the Church is strengthened.” They will also each receive the formal decree (or papal bull) announcing their creation as a cardinal.

The scarlet biretta is, as the pope will recite, a “sign of the dignity of the cardinalate, signifying your readiness to act with courage, even to the shedding of your blood, for the increase of the Christian faith, for the peace and tranquility of the people of God, and for the freedom and growth of the holy Roman Church.”

Immediately before, the new cardinals will make a profession of faith by reciting the Creed. They then pronounce an oath of fidelity and obedience to the pope and his successors.

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The pope will also assign each new cardinal a church in the Diocese of Rome, called a “titular church.” This further links the cardinal to Rome and to the pope, who is the bishop of Rome.

The other members of the College of Cardinals, clergy, Catholics, and members of the public may all attend a consistory to create cardinals.

So, how many cardinals will there be, and why does it matter?

St. Paul VI established in 1970 that cardinals aged 80 and over cannot participate in the process of electing a pope — thus, cardinals who are younger than 80 are known as “electors.” Paul VI also established a numerical limit for the number of electors, capping it at 120, but the number occasionally has risen above that number.   

The number of cardinal electors in the college — and indeed the number of cardinals in general — is always changing, since at any time cardinals may be celebrating their 80th birthday or may have died.

As of October of this year, 15 members of the College of Cardinals have turned 80 since the last consistory, thus losing their chance to participate in a future papal election, according to the National Catholic Register, CNA’s sister news partner.

After the December consistory, there will be 141 cardinal electors (barring the unexpected death of any of the cardinals) — 111 (79%) of whom have been appointed by Pope Francis.

Since his election in 2013, Pope Francis has created 142 cardinals from 70 countries at nine consistories.