Who is Mojtaba Khamenei, Iran's new supreme leader?

Mojtaba Khamenei, the son of Iran's Ayatollah Ali Khamenei who was killed in US-Israeli strikes, has been chosen as his successor.

Unlike his father, the 56-year-old has largely kept a low profile. He has never held government office, nor given public speeches or interviews, and only a limited number of photos and videos of him have ever been published.

However, there are longstanding rumours about his influence on his father. US diplomatic cables, which were published by WikiLeaks in the late 2000s, described him as "the power behind the robes" who was widely regarded as a "capable and forceful leader" within the regime, according to AP news agency.

But Mojtaba Khamenei's selection could prove controversial. The Islamic Republic was founded in 1979 after the monarchy was overthrown, and its ideology is based on the principle that the supreme leader should be chosen for his religious standing and proven leadership, not through hereditary succession.

Ali Khamenei spoke only in general terms about the future leadership of the Islamic Republic.

He opposed the idea of Mojtaba being a candidate for future leadership, a member of the Assembly of Experts said two years ago. But he had never publicly addressed such speculation.

So, who is Mojtaba Khamenei?

Born on 8 September 1969 in the northeastern city of Mashhad, Mojtaba is the second of Khamenei's six children. He received his secondary education at the religious Alavi School in Tehran.

At age 17, Mojtaba served in the military for several short periods during the Iran-Iraq War, according to Iranian media. The eight-year bloody conflict made the regime even more suspicious of the US and the West, which supported Iraq.

In 1999, Mojtaba went to Qom, a holy city which is considered an important centre of Shia theology, to continue his religious studies. It is notable that he did not wear clerical clothing until this time, and it is unclear why he decided to attend a seminary at 30, as it is more usual to do so in one's younger years.

Mojtaba remains a mid-ranking cleric, which could pose an obstacle to his ascendance as the supreme leader.

In recent days, some media outlets and officials close to centres of power in Iran have started referring to Mojtaba Khamenei as "Ayatollah", a senior clerical title. The shift appears to some observers as an attempt to elevate his religious standing and present him as a credible leader.

In the seminary system, holding the rank of "Ayatollah" and teaching advanced classes are regarded as indicators of a person's scholarly level and knowledge, and are considered one of the requirements and prerequisites for selecting a future leader.

But there has already been a precedent. Ali Khamenei was quickly promoted as "Ayatollah" after he became the second supreme leader in 1989.

Accusations of political interference

Mojtaba's name first entered the public spotlight during the 2005 presidential election, which resulted in the victory of Mahmoud Ahmadinejad, a populist hardliner.

In an open letter to Khamenei, reformist candidate Mehdi Karroubi accused Mojtaba of interfering in the vote through elements of the IRGC and the Basij militia, which distributed money to religious groups in order to help Ahmadinejad win.

Four years later, Mojtaba faced the same accusation. The re-election of Ahmadinejad triggered mass protests across the country known as the Green Movement. Some protesters chanted slogans opposing the idea that Mojtaba could succeed his father as Iran's supreme leader.

Mostafa Tajzadeh, then deputy interior minister, described the result as an "electoral coup". He was imprisoned for seven years, which he attributed to "the direct wish of Mojtaba Khamenei".

Two reformist candidates, Mir-Hossein Mousavi and Mehdi Karoubi, were put under house arrest after the 2009 election. In Feb 2012, Mojtaba met and urged Mousavi to give up his protest, Iranian sources told BBC News Persian.

Many expect Mojtaba to continue his father's hardline policies as supreme leader.

Some also believe that a man who has lost his father, his mother and his wife in US-Israeli strikes will be unlikely to bow to Western pressure.

But he also faces the daunting task of ensuring the survival of the Islamic Republic and convincing the public that he is the right person to lead the country out of political and economic devastation.

His leadership record remains largely untested, and the perception that the republic is turning into a hereditary system could further deepen public discontent.

Mojtaba is now a marked man – as Israel's defence minister has said the next supreme leader will be "an unequivocal target for elimination".