Ayatollah Ali Khamenei, Iran's supreme leader for 36 years, has been killed in US and Israeli airstrikes on his country, according to US President Donald Trump. Iran did not immediately confirm his death.

As one of Iran's longest-serving leaders, Khamenei has been almost as ubiquitous in Iranian society as his predecessor, Ayatollah Ruhollah Khomeini, who founded the Islamic Republic of Iran in 1979.

And despite the fact Khomeini authored the Iranian Revolution, some say Khamenei was actually the most powerful leader modern Iran has had.

In more than three decades as supreme leader, Khamenei amassed unprecedented power over domestic politics and cracked down ever more harshly on internal dissent. In recent years, he prioritized his survival – and that of his regime – above all else. His government brutally put down a popular uprising in December 2025–January 2026 that killed thousands.

Ultimately, though, Khamenei will not be remembered by most Iranians as a strong leader. Nor will he be revered. Instead, his legacy will be the profound weakness his regime brought the Islamic Republic on all fronts.

Khamenei's rise through the ranks

Khamenei was born in the city of Marshad in northeastern Iran in 1939. As a boy, he began to form his political and religious worldview by studying at Islamic seminaries in Najaf and Qom.

At 13, he started to embrace ideas relating to revolutionary Islam. These included the teachings of cleric Navab Safavi, who often called for political violence against the rule of the shah of Iran, Mohammad Reza Pahlavi.

Khamenei met Khomeini in 1958 and immediately embraced his philosophy, often referred to as "Khomeinism."

This worldview was informed by anti-colonial sentiment, Shia Islam and elements of social engineering through state planning, particularly when it came to preserving a "just" Islamic society. Khomeinism stipulates that a system of earthly laws alone cannot create a just society – Iran must draw its legitimacy from "God Almighty."

The concept of velayat-e faqih, also known as guardianship of the jurist, is central to Khomeinism. It dictates that the supreme leader should be endowed with "all the authorities that the Prophet and infallible Imams were entitled."