Millions of Iranians are mourning the death of Grand Ayatollah Hossein Ali Montazeri who is due to be buried in the holy city of Qom on Monday. <br /><br />Montazeri, who died on Sunday aged 87, was one of the architects of Iran's Islamic Revolution but eventually became one of the government's fiercest critics.<br /><br />Montazeri's stance against Iran's leadership made him a hero of the country's opposition, while his criticisms were all the more stinging because of his stature as one of Shia Islam's most revered clerics.<br /><br />Al Jazeera's Nazanine Sadri reports.
