(CNN) Pope Francis led tributes to his predecessor on Saturday, after Pope Emeritus Benedict XVI died in a monastery in the Vatican at the age of 95.
"We are moved as we recall him as such a noble person, so kind and we feel such gratitude in our hearts, gratitude to god for giving him to the church, and to the world," Francis said in Saint Peter's Basilica while leading traditional vespers ceremony ahead of New Year's Day.
"Gratitude to him for all the good he accomplished and above all for his witness of faith and prayer, especially in these last years of his life. Only God knows the value of his sacrifices for the good of the church," Francis added.
Benedict, who was the first pontiff in almost 600 years to resign his position, rather than hold office for life, passed away on Saturday, according to a statement from the Vatican.
"With sorrow I inform you that the Pope Emeritus, Benedict XVI, passed away today at 9:34 in the Mater Ecclesiae Monastery in the Vatican," the Director of the Press Office of the Holy See, Matteo Bruni said.
Francis went to see Pope Emeritus Benedict XVI soon after he passed away Saturday morning, according to Bruni.
The funeral of Pope Emeritus Benedict XVI will be held on Thursday in St. Peter's Square in the Vatican City at 9:30 a.m. local time, Bruni said. The funeral will be led by Pope Francis.
The former pope's body will lie in state in St. Peter's Basilica in the Vatican from Monday for the faithful to bid farewell, Vatican News reported. As per the wish of Pope Emeritus, his funeral will be "simple," Bruni said.
News of Benedict's death came days after Pope Francis asked the faithful to pray for him, saying he was "very sick."
His health had been in decline for some time.
Benedict stunned the Catholic faithful and religious experts around the world on February 11, 2013, when he announced plans to step down from his position as Pope, citing his "advanced age."
In his farewell address, the outgoing pope promised to stay "hidden" from the world, but he continued to speak out on religious matters in the years following his retirement, contributing to tensions within the Catholic Church.
Benedict was a powerful force in the Catholic Church for decades. Born Joseph Ratzinger in Germany in 1927, he was the son of a policeman. He was ordained as a priest in 1951, made a cardinal in 1977, and later served as chief theological adviser to Pope John Paul II.
One of his most significant steps up came in 1981 when he took over as head of the Congregation for the Doctrine of Faith, the Vatican office that oversees "the doctrine on the faith and morals throughout the Catholic world," according to the Vatican.
Ratzinger became known as "Cardinal No" stemming from his efforts to crack down on the liberation theology movement, religious pluralism, challenges to traditional teachings on issues such as homosexuality, and calls to ordain women as priests.
He was elected pope in April 2005, following John Paul II's death.
He was known to be more conservative than his successor, Pope Francis, who has made moves to soften the Vatican's position on abortion and homosexuality, as well as doing more to deal with the sexual abuse crisis that has engulfed the church in recent years and clouded Benedict's legacy.
In April 2019, Benedict discussed the sex abuse crisis in a public letter, claiming that it was caused in part by the sexual revolution of the 1960s and the liberalization of the church's moral teachings.
In January 2020, Benedict was forced to distance himself from a book widely seen as undercutting Francis as he considered whether or not to allow married men to become priests in certain cases. The book, "From the Depths of Our Hearts," argued in favor of the centuries-old tradition of priestly celibacy within the Catholic Church. Benedict was originally listed as co-author, but later clarified that he had only contributed one section of the text.
A year later, Benedict came under fire over his time as archbishop of Munich and Freising, between 1977 and 1982, following the publication of a Church-commissioned report into abuse by Catholic clergy there.
The report found that while in the post he had been informed of four cases of sexual abuse involving minors -- including two that had occurred during his time in office -- but failed to act. It also revealed Benedict had attended a meeting about an abuser identified as Priest X. Following the report's publication, Benedict pushed back against accusations that he knew in 1980 that this priest was an abuser.
In a letter released by the Vatican amid the furor, Benedict wrote that he was "of good cheer" as he faced "the final judge of my life," despite his shortcomings. He also issued a general apology to survivors of abuse.
Global leaders paid homage to the former pope, following his death. Justin Welby, the Archbishop of Canterbury and head of the Church of England, said he is "mourning" the former pope.
"Pope Benedict was one of the greatest theologians of his age -- committed to the faith of the Church and stalwart in its defence," Welby said in a statement Saturday.
"In all things, not least in his writing and his preaching, he looked to Jesus Christ, the image of the invisible God. It was abundantly clear that Christ was the root of his thought and the basis of his prayer.
"In 2013 Pope Benedict took the courageous and humble step to resign the papacy, the first Pope to do so since the fifteenth century. In making this choice freely he acknowledged the human frailty that affects us all," he added.
Cardinal Timothy Dolan, Archbishop of New York, said he will remember the former pope with "love and gratitude."
"Saddened to learn of the demise of His Holiness Pope Emeritus Benedict XVI," European Parliament President Roberta Metsola tweeted Saturday.
"Europe mourns him. May he rest in peace."
The leader of the Russian Orthodox Church, Patriarch Kirill, on Saturday told Pope Francis he had received news of Benedict's passing with "sorrow," according to the message shared on the official website of the Moscow Patriarchate.
"His Holiness's many years of life marked a whole epoch in the history of the Roman Catholic Church, which he led in a difficult historical period, associated with many external and internal challenges," Kirill said of Benedict.
Kirill added relations between the Russian Orthodox Church and the Roman Catholic Church had "developed significantly" during Benedict's tenure, in an effort to "overcome the sometimes-painful legacy of the past."
"On behalf of the Russian Orthodox Church, I express my condolences to you and the flock of the Roman Catholic Church," he continued.
The Dalai Lama on Sunday offered his condolences to the members of the Catholic Church after Benedict's death.
"I pray for our spiritual brother," he wrote, "and offer my condolences to the members of the Catholic Church."
"At a time when we are seeing tension in several parts of the world, we can take a lesson from the life of Pope Benedict and do what we can to contribute to religious harmony and global peace."
US President Joe Biden said the late pontiff "will be remembered as a renowned theologian, with a lifetime of devotion to the Church, guided by his principles and faith."
Biden, the second Catholic to serve as President of the United States, reflected on his meeting with Benedict at the Vatican in 2011, saying he remembered "his generosity and welcome as well as our meaningful conversation."
"As he remarked during his 2008 visit to the White House, 'the need for global solidarity is as urgent as ever, if all people are to live in a way worthy of their dignity.' May his focus on the ministry of charity continue to be an inspiration to us all," Biden added.
British Prime Minister Rishi Sunak also paid tribute. "I am saddened to learn of the death of Pope Emeritus Benedict XVI," Sunak tweeted Saturday.
"He was a great theologian whose UK visit in 2010 was an historic moment for both Catholics and non-Catholics throughout our country.
Italy's new Prime Minister Giorgia Meloni voiced her admiration for the former pope. "Benedict XVI was a giant of faith and reason. He put his life at the service of the universal Church and spoke, and will continue to speak, to the hearts and minds of men with the spiritual, cultural and intellectual depth of his Magisterium," she tweeted Saturday.
Russian President Vladimir Putin, who is leading Moscow's invasion of Ukraine, called the former pope "a staunch defender of traditional Christian values."