HASHEM Safieddine, reported by Israel as apparently killed in its confrontation with Hizbollah, is widely seen as Hassan Nasrallah's likely successor as head of the Iran-backed group.
A relative of Nasrallah, he has been running the movement alongside its deputy secretary general Naim Qassem since the assassination by Israel on Sept. 27.
Safieddine has sat on the group's Jihad Council - the body responsible for its military operations.
He is also head of its executive council, overseeing financial and administrative affairs for the Iran-backed group.
While not as well-known to Israelis as Nasrallah, Safieddine is seen by Israel as a leading target in what it deems a terrorist organisation and a proxy for arch-foe Iran.
Safieddine assumed a prominent role speaking for Hizbollah during the past year of hostilities with Israel, addressing funerals and other events that Nasrallah had long avoided for security reasons.
He was the first Hizbollah official to speak in public after the group's Palestinian ally Hamas attacked southern Israel on Oct. 7, 2023, igniting the Gaza war that drew the Lebanese Shi'ite Islamist movement into a parallel conflict with Israel.
With observers across the Middle East waiting to see what Hizbollah might do to help Hamas, Safieddine told a rally in Beirut's southern suburbs the day after the attack that the group's "guns and our rockets are with you".
"Everything we have is with you," Safieddine declared.
Like Nasrallah, Safieddine wears the black turban denoting his status as a sayyed, or descendent of the Prophet Mohammed. He bears a strong physical resemblance to Nasrallah.
He hails from a prominent Lebanese Shi'ite family, and was born in the country's predominantly Shi'ite south.
Safieddine studied at religious seminaries in the Iranian city of Qom before returning to Lebanon in the 1990s to assume leadership responsibilities in the group.
He maintained strong ties to Hizbollah's backers in Iran.
His son, Rida, is married to the daughter of the late Iranian general Qassem Soleimani, head of Iran's Revolutionary Guards' Quds Force until he was killed by a US drone strike in Baghdad in 2020.
His brother, Abdullah, serves as Hizbollah's representative in Tehran.
As executive council chief, Safieddine plays a role some likened to that of prime minister of a government, responsible for an array of Hizbollah institutions involved in health care, education, culture, and construction, and other activities.
He led efforts to rebuild the Hizbollah-controlled southern suburbs of Beirut following the group's 2006 war with Israel, when swathes of the area were flattened by Israeli airstrikes.
In a 2012 speech, Safieddine said the post-war reconstruction had amounted to "a new victory" over Israel.
Phillip Smyth, an expert who studies Iran-backed Shi'ite militias, said Nasrallah "started tailoring positions for him within a variety of different councils within Lebanese Hizbollah. Some of them were more opaque than others".
The US State Department declared him a specially designated global terrorist in 2017.
In response to US pressure on Hizbollah that same year, he said "this mentally impeded, crazy US administration headed by Trump will not be able to harm the resistance".
* This article is by Reuters