Pope Benedict XVI shocked the world Monday, announcing plans to step down as leader of the Catholic Church - the first pope to do so in nearly 600 years.
From the start, Pope Benedict faced a difficult road, following the popular Pope John Paul the Second.
He was embraced by some, but shunned by others.
The pope was born Joseph Ratzinger in a small town in Germany in 1927, the son of a police officer.
As a young man, he studied at a seminary. In World War II, he said, he was forced to join the Hitler Youth, though he said he defected as the war neared an end.
He was ordained in 1951 and taught theology before working his way up the church hierarchy. The further up the ranks he climbed, the more conservative his views became.
When he became pope in 2005, his first message was one of humility.
"The cardinals have elected me - a simple, humble worker in the vineyard of the Lord. The fact that the Lord can work and act even with insufficient means consoles me, and above all I entrust myself to your prayers," he said.
At times, Pope Benedict's papacy was rocky. In 2006, he enraged Muslims during a speech at a German University when he quoted the words of a medieval emperor.
"Show me just what Muhammad brought that was new, and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached,'' said the Pope Benedict.
Reaction was swift and angry. Later that year, the pope traveled to Turkey and prayed at the Blue Mosque. He met with Muslim and Arab leaders through the years.
For much of his reign, the Church was embroiled in what seemed to be an ever widening priest-sex-abuse scandal.
In 2010, the pope apologized and promised - never again.
"We too insistently beg forgiveness from God and from the persons involved, while promising to do everything possible to ensure that such abuse will never occur again,'' he said.
The pope was known for his conservative views on abortion, homosexuality, and birth control, but he created a stir about a year ago when he wrote that condoms could be justified in cases of prostitution - to reduce the risk of HIV - though some said that came too late.
But the pope also moved the Catholic Church into the digital age, sending his first Tweet in December. He also got the Vatican its first electric car, having expressed concerns about the environment.
At the start of his papacy, Pope Benedict was seen as a choice for continuity. It now will be up to history to determine whether he fulfilled that role or whether his impact on the Church will be greater.
Pope Benedict greets the crowd from the central balcony of St. Peter's Basilica at the Vatican, April 19, 2005.
Pope Benedict blesses a baby as he rides around St. Peter's Square to hold his last general audience at the Vatican Feb. 27, 2013.
Pope Benedict appears on a giant screen in a packed St. Peter's Square at the Vatican during his last general audience, February 27, 2013.
Pope Benedict arrives to attend a meeting with seminarians at the Romano Maggiore seminary in Rome, February 8, 2013.
Pope Benedict waves as he arrives to lead the weekly general audience in St. Peter's Square at the Vatican, April 18, 2012.
Pope Benedict wears a sombrero, a traditional Mexican hat, while being driven through the crowd before officiating a mass in Silao, Mexico, March 25, 2012.
Pope Benedict holds his cross as he leads a solemn mass in Zagreb, Croatia, June 5, 2011.
Pope Benedict visits the Ardeatine Caves Memorial in Rome, Italy, March 27, 2011.
Pope Benedict leaves after an audience with Vatican-accredited diplomats at the Vatican, January 10, 2011.
Pope Benedict visits the Western Wall, Judaism's holiest prayer site, in Jerusalem's Old City, May 12, 2009.
Pope Benedict waves to the crowd gathered in Saint Peter's square during his weekly Angelus blessing at the Vatican, May 16, 2010.
U.S. President Barack Obama and his wife Michelle Obama meet with Pope Benedict at the Vatican, July 10, 2009.