Mojtaba Khamenei, son of Iran’s late Supreme Leader Ayatollah Ali Khamenei, has long been seen as a potential successor despite never holding elected office or an official government post.

His profile rose even before last week’s Israeli strike killed his father, thrusting Iran’s leadership succession into uncertainty.

A secretive figure within the Islamic Republic, Mojtaba has not been seen publicly since Saturday, when the attack on the supreme leader’s offices also claimed the life of his wife, Zahra Haddad Adel, a scion of a family closely tied to Iran’s theocracy.

Though his exact whereabouts remain unknown, he is believed to be in hiding as American and Israeli airstrikes continue across Iran. State media have remained silent on his status.

Despite past criticism that elevating him could turn Iran into a theocratic version of a hereditary monarchy, Mojtaba Khamenei remains a key name in speculation over the country’s next paramount ruler.