Pope Benedict XVI waves in St. Peter's Square in the Vatican in December 2012. Benedict, 85, announced on Monday, February 11, that he will resign at the end of February "because of advanced age." The last pope to resign was Gregory XII in 1415.
Joseph Ratzinger, who became the 265th pope in 2005, poses for a photo while a German air force assistant in 1943.
Cardinal Joseph Ratzinger, right, poses for a picture in Vatican City in June 1977 with fellow cardinals, from left, Cardinal Gappi, Cardinal Tomazek, Cardinal Gantin and Cardinal Benelli. Ratzinger was named cardinal-priest of Santa Maria Consolatrice al Tiburtino by Pope Paul VI in June 1977.
Ratzinger, who was serving as cardinal-priest of Santa Maria Consolatrice al Tiburtino, visits Madrid in 1989.
Ratzinger fills in for Pope John Paul II during the Easter Vigil service in Saint Peter's Basilica in March 2005.
Newly elected as pope, Benedict XVI gestures to the crowd in St. Peter's Square in Vatican City on April 19, 2005.
Benedict meets Prince Albert II of Monaco at the pope's private library in Vatican City in December 2005.
Benedict kisses the altar before addressing the crowds at Jasna Gora Monastery in Czestochowa, Poland, in May 2006.
Benedict waves from under an umbrella as he arrives to lead his weekly general audience in Saint Peter's Square at the Vatican in October 2007.
Benedict speaks at the United Nations General Assembly in New York in April 2008.
Benedict celebrates a Mass at the end of a synod of Catholic bishops in October 2008 at St. Peter's Basilica at the Vatican.
Benedict attends a screening of a movie about his predecessor, Pope John Paul II, on October 16, 2008, in Vatican City during celebrations of the 30th anniversary of John Paul's election as pontiff.
Benedict kneels as he prays in front of Pope John XXIII's tomb in St. Peter's Basilica at the Vatican on October 28, 2008, to commemorate the 50th anniversary of John's election to the papacy.
Benedict talks with bishops in Saint Peter's Square at the Vatican after his weekly general address in November 2009.
Benedict blesses pilgrims as he arrives in St. Peter's Square in his popemobile in March 2010 to meet with young people from Rome and the Lazio region in preparation for World Youth Day.
The pope salutes from his popemobile in St. Peter's Square in March 2010.
Benedict prepares to celebrate Mass at San Giovanni della Croce parish in Rome in March 2010.
Benedict prays on Good Friday in April 2010 at the Roman Colosseum.
Benedict celebrates an open-air Mass in the Terreiro do Paco in Lisbon, Portugal, in May 2010.
Benedict prepares to celebrate a Mass for 70,000 people in September 2011 in Berlin.
Benedict waves to the crowd gathered at the Colosseum in Rome during the Way of the Cross procession on Good Friday in April 2012.
A gust of wind blows Benedict's collar into his face in September 2012 during his weekly address in Saint Peter's Square.
Benedict speaks with Nikolaus Schneider, praeses of the Evangelical Church in the Rhineland, before a Mass at the Augustinian monastery in Erfurt, Germany, in September 2011.
Benedict waves to pilgrims as he arrives at St. Peter's Square for his weekly address in October 2012.
Benedict looks at a chess game with Ivory Coast President Alassane Ouattara during a private audience in November 2012 at the Vatican.
Benedict arrives to lead the Vesper prayer with members of Rome's universities in December 2012 at St. Peter's Basilica.
Benedict clicks on a tablet to send his first tweet from his account @pontifex at the Vatican in December 2012.
Benedict celebrates Mass during a visit to San Patrizio al Colle Prenestino parish on the outskirts of Rome in December 2012.
Benedict blesses members of the ecumenical Christian community of Taize, a group based in Taize, France, in St. Peter's Square in December 2012.
Benedict, accompanied by Grand Master Matthew Festing of the Sovereign Military Order of Malta, right, shakes hands with a woman after the Mass in St. Peter's Basilica to mark the 900th anniversary of the Order of the Knights of Malta on February 9, 2013, at the Vatican.
- Timothy Stanley: Benedict XVI's resignation is historic since popes usually serve for life
- He says pope not so much conservative as asserting church's "living tradition"
- He backed traditionalists, but a conflicted flock, scandal, culture wars a trial to papacy, he says
- Stanley: Pope kept to principle, and if it's not what modern world wanted, that's world's problem
Editor's note: Timothy Stanley is a historian at Oxford University and blogs for Britain's The Daily Telegraph. He is the author of "The Crusader: The Life and Times of Pat Buchanan."
(CNN) -- Journalists have a habit of calling too many things "historic" -- but on this occasion, the word is appropriate. The Roman Catholic Church is run like an elected monarchy, and popes are supposed to rule until death; no pope has stepped down since 1415.
Therefore, it almost feels like a concession to the modern world to read that Benedict XVI is retiring on grounds of ill health, as if he were a CEO rather than God's man on Earth. That's highly ironic considering that Benedict will be remembered as perhaps the most "conservative" pope since the 1950s -- a leader who tried to assert theological principle over fashionable compromise.
The world "conservative" is actually misleading, and the monk who received me in to the Catholic Church in 2006 -- roughly a year after Benedict began his pontificate -- would be appalled to read me using it. In Catholicism, there is no right or left but only orthodoxy and error. As such, Benedict would understand the more controversial stances that he took as pope not as "turning back the clock" but as asserting a living tradition that had become undervalued within the church. His success in this regard will be felt for generations to come.
He not only permitted but quietly encouraged traditionalists to say the old rite, reviving the use of Latin or receiving the communion wafer on the tongue. He issued a new translation of the Roman Missal that tried to make its language more precise. And, in the words of one priest, he encouraged the idea that "we ought to take care and time in preparing for the liturgy, and ensure we celebrate it with as much dignity as possible." His emphasis was upon reverence and reflection, which has been a healthy antidote to the 1960s style of Catholicism that encouraged feverish participation bordering on theatrics.
Nothing the pope proposed was new, but it could be called radical, trying to recapture some of the certainty and beauty that pervaded Catholicism before the reforming Vatican II. Inevitably, this upset some. Progressives felt that he was promoting a form of religion that belonged to a different century, that his firm belief in traditional moral theology threatened to distance the church from the people it was supposed to serve.
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If that's true, it wasn't the pope's intent. Contrary to the general impression that he's favored a smaller, purer church, Benedict has actually done his best to expand its reach. The most visible sign was his engagement on Twitter. But he also reached out to the Eastern Orthodox Churches and spoke up for Christians persecuted in the Middle East.
In the United Kingdom, he encouraged married Anglican priests to defect. He has even opened up dialogue with Islam. During his tenure, we've also seen a new embrace of Catholicism in the realm of politics, from Paul Ryan's nomination to Tony Blair's high-profile conversion. And far from only talking about sex, Benedict expanded the number of sins to include things such as pollution. It's too often forgotten that in the 1960s he was considered a liberal who eschewed the clerical collar.
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The divisions and controversies that occurred under Benedict's leadership had little to do with him personally and a lot more to do with the Catholic Church's difficult relationship with the modern world. As a Catholic convert, I've signed up to its positions on sexual ethics, but I appreciate that many millions have not. A balance has to be struck between the rights of believers and nonbelievers, between respect for tradition and the freedom to reject it.
As the world has struggled to strike that balance (consider the role that same-sex marriage and abortion played in the 2012 election) so the church has found itself forced to be a combatant in the great, ugly culture war. Benedict would rather it played the role of reconciler and healer of wounds, but at this moment in history that's not possible. Unfortunately, its alternative role as moral arbiter has been undermined by the pedophile scandal. Nothing has dogged this pontificate so much as the tragedy of child abuse, and it will continue to blot its reputation for decades to come.
For all these problems, my sense is that Benedict will be remembered as a thinker rather than a fighter. I have been so fortunate to become a Catholic at a moment of liturgical revival under a pope who can write a book as majestic and wise as his biography of Jesus. I've been lucky to know a pope with a sense of humor and a willingness to talk and engage.
If he wasn't what the modern world wanted -- if he wasn't prepared to bend every principle or rule to appease all the people all the time -- then that's the world's problem rather than his. Although he has attained one very modern distinction indeed. On Monday, he trended ahead of Justin Bieber on Twitter for at least an hour.
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The opinions expressed in this commentary are solely those of Timothy Stanley.