Lebanon's parliament elected army chief Joseph Aoun head of state on Thursday, filling the vacant presidency with a general who has U.S. support and showing the weakened sway of the Iran-backed Hezbollah group after its devastating war with Israel.

In a speech to the chamber, Aoun, 60, vowed to work to ensure the state has the exclusive right to carry arms, drawing loud applause as lawmakers from Hezbollah -- which runs its own military forces -- sat still.

He promised to rebuild south Lebanon and other parts of the country he said had been destroyed by Israel, and also to prevent Israeli attacks on Lebanon, which was mired in deep economic and political crises even before the latest conflict. "Today, a new phase in the history of Lebanon begins," he said.

His election reflected shifts in the power balance in Lebanon and the wider Middle East, with Shi'ite Muslim Hezbollah badly pummelled from last year's war, and its Syrian ally Bashar al-Assad toppled in December.

It also indicated a revival of Saudi influence in a country where Riyadh's role was eclipsed by Iran and Hezbollah long ago.

Israeli Foreign Minister Gideon Saar congratulated Lebanon, saying on X he hoped Aoun's election would contribute towards stability and good neighbourly relations.

U.S. ambassador Lisa Johnson, attending the session, told Reuters she was "very happy" with Aoun's election.

The presidency, reserved for a Maronite Christian in Lebanon's sectarian power-sharing system, has been vacant since Michel Aoun's term ended in October 2022, with deeply divided factions unable to agree on a candidate able to win enough votes in the 128-seat parliament.

Joseph Aoun fell short of the 86 votes needed in a first round vote, but crossed the threshold with 99 votes in a second round, after lawmakers from Hezbollah and its Shi'ite ally the Amal Movement backed him.

Hezbollah lawmaker Mohammed Raad said that by delaying their vote for Aoun, the group had "sent a message that we are the guardians of national consensus".

Momentum built behind Aoun on Wednesday as Hezbollah's long preferred candidate, Suleiman Frangieh, withdrew and declared support for the army commander, and as French and Saudi envoys shuttled around Beirut, urging his election in meetings with politicians, three Lebanese political sources said.

A source close to the Saudi royal court said French, Saudi, and U.S. envoys had told Parliament Speaker Nabih Berri, a close Hezbollah ally, that international financial assistance - including from Saudi Arabia - hinged on Aoun's election.

"There is a very clear message from the international community that they are ready to support Lebanon, but that needs a president, a government," Michel Mouawad, a Christian lawmaker opposed to Hezbollah who voted for Aoun, told Reuters.

"We did get a message from Saudi of support," he added.

The Saudi king and crown prince congratulated Aoun.

FRANCE URGES FORMATION OF STRONG GOVERNMENT

His election is a first step towards reviving government institutions in a country which has had neither a head of state nor a fully empowered cabinet since Aoun left office.

Lebanon, its economy still reeling from a financial collapse in 2019, is in dire need of aid to rebuild from the war, which the World Bank estimates cost the country $8.5 billion.

Much of the damage is in majority Shi'ite areas where Hezbollah draws support. Hezbollah has urged Arab and international support for Lebanon.

Lebanon's system of government now requires Aoun to convene consultations with lawmakers to nominate a Sunni Muslim prime minister to form a new cabinet, a process that can often be protracted as factions barter over ministerial portfolios.

France said the election opened a new page for Lebanon.

"This election must now be followed by the appointment of a strong government" capable of "carrying out the reforms necessary for Lebanon's economic recovery, stability, security and sovereignty," French foreign ministry spokesman Christophe Lemoine said.

Lebanon's international bonds, which have been in default since 2020, rallied after Aoun's victory was announced.

Aoun has played a key role in shoring up a ceasefire between Hezbollah and Israel which was brokered by Washington and Paris in November. The terms require the Lebanese army to deploy into south Lebanon as Israeli troops and Hezbollah withdraw forces.

Opponents of his candidacy said his election was the result of foreign pressure. Lawmaker Gebran Bassil, leader of one of the biggest Christian factions, told the session that many lawmakers had received "instructions from abroad".

But Melhem Riachi, a Christian lawmaker who voted for Aoun, said the election marked the end of the previous era with "an Iranian face". "This is the era of Lebanon's harmony with the international community," he said.