The Roman Catholic leader will also celebrate Mass at an event expected to attract 10,000 people.
Pope Francis is visiting parts of northern Iraq that were held by Islamic State (IS) militants on the third day of his historic trip to the country.
Christians were among those targeted by IS when they seized the region in 2014, carrying out human rights abuses.
The Pope has arrived in the city of Mosul where he is praying among the ruins of its churches, several of which were destroyed during the fighting.
Later he will celebrate Mass in Irbil, with up to 10,000 attendees expected.
There are fears the service could become a coronavirus super-spreader event.
Iraq has seen a sharp rise in Covid-19 infections over the past month. The 84-year-old leader of the Catholic Church and his entourage have all been vaccinated, but Iraq only received its first batch of doses last week.
The four-day trip, which began on Friday, is the pontiff’s first international excursion since the start of the pandemic more than a year ago, and the first ever papal visit to the country.
After arriving in Irbil, he was welcomed by the head of Iraq’s Kurdistan region, Nechirvan Barzani.
He then travelled by helicopter on to Mosul where he visited Church Square to pray for the victims of the war with the Islamic State group, which left thousands of civilians dead.
Surrounded by the tottering ruins of the square’s four churches, he said the exodus of Christians from Iraq and the broader Middle East had done “incalculable harm not just to the individuals and communities concerned but also to the society they leave behind”.
Referring to the historic region of Mesopotamia, which covered much of modern Iraq including Mosul, Pope Francis said: “How cruel it is that this country, the cradle of civilisation, should have been afflicted by so barbarous a blow, with ancient places of worship destroyed and many thousands of people – Muslims, Christians, Yazidis and others – forcibly displaced or killed.
“Today, however, we reaffirm our conviction that fraternity is more durable than fratricide, that hope is more powerful than hatred, that peace more powerful than war.”
IS desecrated Christian places of worship, beheading religious statues and planting booby-trap bombs. Tens of thousands of Christians fled IS control while those who remained faced having their property stolen and choosing between paying a tax, converting to Islam, leaving or facing death.
A cross erected on Church Square in honour of the Pope’s visit was crafted from wooden chairs rescued from churches across the region, Middle Eastern news outlet The National reports.
The pontiff is also due to visit nearby Qaraqosh to see Iraq’s largest church, which was partly destroyed by IS.
People gathered in the town in joyful anticipation of his visit.
“I can’t describe my happiness, it’s a historic event that won’t be repeated,” said Yosra Mubarak, 33, who was three months pregnant when she left her home seven years ago with her husband and son, fleeing the violence.
“It was a very difficult journey, we fled with only the clothes we’re wearing… There was nothing left [when we returned], but our only dream was to come back and here we are and the Pope is coming,” she told Reuters news agency.
Since arriving in Baghdad on Friday, Pope Francis has called for an end to violence and extremism and said that Iraq’s dwindling Christian community should have a more prominent role as citizens with full rights, freedoms and responsibilities.
On Saturday, in a highly symbolic meeting with the Grand Ayatollah Ali al-Sistani in the holy city of Najaf, the Pope echoed this message, saying that Christians should be able to live in peace and security like all other Iraqis.
Audiences with the reclusive 90-year-old spiritual leader of millions of Shia Muslims are rare, but he received the Pope for around 50 minutes, the pair talking without face masks.
The Pope then visited the site of the ancient city of Ur, believed to be the birthplace of the Prophet Abraham, who is revered in Judaism, Christianity and Islam.
Iraq has been wracked by religious and sectarian violence, both against minorities and between Shia and Sunni Muslims too.
One of the world’s oldest Christian communities has seen its numbers plummet over the last two decades from 1.4 million to about 250,000, less than 1% of the country’s population.
Many have fled abroad to escape the violence that has plagued the country since the US-led invasion in 2003 that ousted Saddam Hussein.
A US state department report on religious freedom in Iraq in 2019 found that Christians, as well as Sunni Muslims, complained of harassment at checkpoints by Shia security forces and some discrimination in education.
On his arrival on Friday, the Pope said Iraq’s Christian community should have a more prominent role as citizens with full rights, freedoms and responsibilities.
- People in what is now Iraq embraced Christianity in the 1st Century AD
- According to the US state department, Christian leaders estimate there are fewer than 250,000 Christians remaining in Iraq, with the largest population – at least 200,000 – living in the Nineveh Plain and Kurdistan Region in the north of the country
- Approximately 67% of those are Chaldean Catholics, whose Eastern-rite Church retains its own liturgy and traditions but recognises the authority of the pope in Rome. Another 20% are members of the Assyrian Church of the East, believed to be the oldest in Iraq
- The rest are Syriac Orthodox, Syriac Catholic, Armenian Catholic, Armenian Apostolic, as well as Anglican, Evangelical and other Protestants