Abdul Aziz al-Hakim was an important power-broker, with strong ties to the US and Iran.
He opposed Saddam Hussein from exile in Iran for more than two decades, before returning to Iraq in 2003 after the US-led invasion.
He took control of the Supreme Council for the Islamic Revolution in Iraq (Sciri - which later became SIIC) after Muhammad Baqr was assassinated.
As heir to the leadership of one of the main anti-Saddam Hussein factions in Iraq, Abdul Aziz al-Hakim managed to keep good ties with both the American authorities and Iran, which strongly backed his group.
The family is revered among Iraq's largest religious community, the Shia, for its tradition of scholarship and its bouts of resistance against Saddam Hussein in its southern Iraqi stronghold.
However, the quietly-spoken Hakim was distrusted by many Sunnis who saw him as too Iranian-orientated and sectarian in his political philosophy.
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