Pope Francis has arrived at Dublin Airport for the Republic of Ireland’s first papal visit for almost 40 years.
The Pope is expected to meet victims of clerical sex abuse later on Saturday.
In a letter to the world’s 1.2bn Roman Catholics, the Pope this week condemned the “atrocities” of child abuse and clerical cover-ups.
The visit coincides with the World Meeting of Families – a global Catholic gathering held every three years.
It will end with a Mass for 500,000 people at Phoenix Park on Sunday.
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The Pope was presented with flowers and vestments by children at the airport.
He is now on his way to Áras an Uachtaráin, the Irish president’s residence, where he will be welcomed by President Michael D Higgins.
The Ireland that he is visiting is a different country to that which greeted Pope John Paul II in 1979.
Since the Polish pope’s visit, there have been huge changes in public attitudes to social issues including abortion, contraception, divorce and same-sex marriage.
The Irish Catholic Church has been engulfed in scandal with the uncovering of widespread clerical sexual abuse of children and cover-ups.
Child sex abuse scandals continue to embroil the Church around the globe.
On Friday, Leo Varadkar, the Irish prime minister (taoiseach), said he hoped Pope Francis’s visit would mark the beginning of a new chapter in Ireland’s relationship with the Church.
“In the past the Catholic Church had too much of a dominant place in our society,” he said.
What welcome awaits the Pope?
By Martin Bashir, BBC religion editor
Back in the 1970s, almost 90% of Irish Catholics would attend weekly Mass. Divorce, abortion and contraception were against the law.
Since then, religious faith and attendance at Mass have been diminished from within: scandal upon scandal has ravaged the Church’s moral authority.
The biggest challenge for the Church in Ireland is not the power of secularism, from without, but the task of establishing moral integrity and moral accountability, from within.
“It still has a place in our society, but not one that determines public policy or determines our laws.”
The taoiseach described the papal visit as one of the biggest events in Ireland in the past 40 years, adding it was also a chance for the Pope to speak directly to those harmed by crimes that took place in Church-run institutions.
The Vatican said the meeting with sex-abuse survivors would not be announced until after it was over, and that it would be up to victims if they wanted to speak afterwards.
On Saturday evening, the Pope will attend the Festival of Families concert in Dublin’s Croke Park stadium.
More than 70,000 people are expected to take part, with the world-renowned tenor Andrea Bocelli due to perform.
Other acts on the bill include Nathan Carter, Daniel O’Donnell, Moya Brennan, the Begley Family and the Priests.
The pontiff will travel to County Mayo on Sunday morning for a visit to Knock Shrine.
He will return to Dublin for an afternoon Mass in front of an estimated 500,000 people in Phoenix Park, to close the World Meeting of Families.
Papal visit to Ireland: Itinerary highlights
Saturday 25 August
- 08:15 – Departure by plane from Rome for Dublin
- 10:30 – Arrival at Dublin Airport for official welcome
- 10:45 – Transfer to Áras an Uachtaráin (Irish president’s residence)
- 11:15 – Welcome ceremony with President Michael D. Higgins
- 12:10 – Arrival at Dublin Castle for meeting with authorities, civil society and diplomatic corps
- 15:30 – Visit to St Mary’s Pro Cathedral
- 16:30 – Private visit to the Capuchin Day Centre, a centre for homeless people
- 19:45 – Preside at the Festival of Families at Croke Park stadium
Sunday 26 August
- 08:40 – Departure by plane for Knock
- 09:45 – Arrival at Knock Shrine for visit to the Apparition Chapel and recitation of the Angelus
- 11:15 – Departure by plane for Dublin
- 12:30 – Lunch with the Papal Delegation
- 15:00 – Closing Papal Mass of the World Meeting of Families in Phoenix Park
- 18:30 – Farewell ceremony at Dublin Airport
- 18:45 – Departure for Rome
- 23:00 – Arrival in Rome
You can follow minute-by-minute updates on the Pope’s visit here on the BBC News website.
Switch on for Sunday’s Newsline showing highlights from the visit at 22:30 BST.
On radio, tune into BBC Radio Ulster on Saturday at 11:30 for live coverage with William Crawley and join Seamus McKee for a special extended The Sunday News at 13:00.
Papal visit: Pope Francis begins two-day Irish visit