ROME — Pope Francis welcomed Lebanon’s Christian religious leaders to the Vatican on Thursday for a day of prayer amid fears that the country’s descent into chaos is further imperiling the Christian presence in the country, a bulwark for the church in the Middle East.

Francis greeted the dozen clerics in the lobby of the Vatican hotel where he lives shortly after 8 a.m. and together they walked across a small piazza inside the Vatican Gardens and entered St. Peter’s Basilica. There, they stood in silent prayer around the altar, and descended to the tomb of the Apostle Peter underneath to light a candle as a sign of peace.

The small group of Christian Orthodox and Catholic churchmen was spending the rest of the morning and afternoon behind closed doors in talks about how to help Lebanon emerge from the political, financial and social crisis that the World Bank has described as one of the worst the world has witnessed over the past 150 years.

At the end of the day, Francis will preside over an ecumenical service in St. Peter’s featuring prayers in Arabic, Syriac, Armenian and Chaldean.

Lebanon, a Mediterranean nation of 5 million, has the largest percentage of Christians in the Middle East and is the only Arab country with a Christian head of state. Christians make up a third of the population.

The country is going through an unprecedented economic and financial collapse, coupled with a monthslong political deadlock over the formation of a new government. The developments pose the gravest threat to its stability since the end of its civil war three decades ago. It is also trying to recover from the devastating Beirut port explosion last summer and the coronavirus pandemic.

The Vatican’s foreign minister, Archbishop Paul Gallagher, was blunt in explaining the Holy See’s “strong concern about the collapse of the country” during a briefing with journalists last week.

He said Francis had invited the religious leaders to Rome in an acknowledgment that the Christian community had been particularly hard-hit by the crisis, which has sent the well-educated middle classes fleeing power cuts, fuel shortages, soaring prices and now sporadic acts of violence.

The crisis, Gallagher said, “risks destroying the internal balance and Lebanon’s own reality, putting at risk the Christian presence in the Middle East.”

Noting the potential for Lebanon to fall into conflict, he said the country must be helped economically and to keep the peace, saying it “remains the final vanguard of an Arab democracy that welcomes, recognizes and coexists with a plurality of ethnic and religious communities that in other countries aren’t able to live in peace.”

“It must be helped to maintain this unique identity, to ensure a pluralist, tolerant and diversified Middle East,” he said.

Francis has said he hopes to visit Lebanon once a government is formed. Gallagher said if that happens soon, Francis could make a trip early next year.