NAJAF, Iraq — Pope Francis on Saturday made a landmark visit to the home of Iraq’s top Shiite cleric Grand Ayatollah Ali al-Sistani.

Matteo Bruni, director of the Holy See press office, said March 6 that the two men spoke for almost an hour during a private meeting at al-Sistani’s residence in Najaf, central Iraq.

“During the courtesy visit, which lasted approximately 45 minutes, the Holy Father stressed the importance of collaboration and friendship between religious communities because, cultivating mutual respect and dialogue, one can contribute to the good of Iraq, the region, and the whole of humanity,” Bruni said.

The meeting — a milestone in relations between the Catholic Church and Shiite Islam — came on the second day of the pope’s historic visit to Iraq.

Francis stayed overnight at the apostolic nunciature in Baghdad. He left the residence early on Saturday morning, traveling by car to Baghdad International Airport.

He took an Iraqi Airways flight to Najaf, a city regarded as the third holiest city of Shiite Islam after Mecca and Medina. He was welcomed by Najaf province governor Louay al-Yasiri at Najaf Airport.

He then traveled by car to al-Sistani’s modest residence. He was greeted at the entrance by the Grand Ayatollah’s son, Mohammed Rida, who led him to the room where his father holds private conversations with visitors.

The Shiite leader is believed to have played a critical role in the defeat of the Islamic State in Iraq. As Iraqi forces faced the Islamic State in 2017, al-Sistani urged all Iraqi citizens to take arms to defend the country, regardless of their ethnicity or religious beliefs. Thousands of volunteers responded to the call and formed the Popular Mobilization Forces, playing a critical role in stopping the Islamic State.

Bruni said: “The meeting was an opportunity for the Pope to thank Grand Ayatollah Al-Sistani because, together with the Shiite community, in the face of the violence and the great difficulties of the past years, he has raised his voice in defense of the weakest and most persecuted, affirming the sacredness of human life and the importance of the unity of the Iraqi people.”

After the private meeting and an official photo, the pope returned to Najaf Airport. He boarded a plane to Nassiriya, a city along the banks of the Euphrates River. He was welcomed by the Chaldean Archbishop Habib Jajou of Basra and Bishop Firas Dardar, leader of the Syriac Patriarchal Exarchate of Basra and the Gulf. Civil and religious authorities were also present.

He then traveled by car to the Plain of Ur for an inter-religious meeting.

“In taking leave of the Grand Ayatollah, the Holy Father reiterated his prayer to God, Creator of all, for a future of peace and fraternity for the beloved land of Iraq, for the Middle East and for the whole world,” Bruni said.