Muhammad Baqir al-Sadr, also known as al-Shahīd al-Khāmis, was an Iraqi philosopher, and the ideological founder of the Islamic Dawa Party, born in al-Kadhimiya, Iraq. He was father-in-law to Muqtada al-Sadr, a cousin of Muhammad Sadeq al-Sadr and Imam Musa as-Sadr. His father Haydar al-Sadr was a well-respected high-ranking Shi'a cleric. His lineage can be traced back to Muhammad through the seventh Shia Imam Musa al-Kazim. Muhammad Baqir al-Sadr was executed in 1980 by the regime of Saddam Hussein along with his sister, Amina Sadr bint al-Huda.

Shia Islam in Iraq has a history going back to the times of Ali ibn Abi Talib, the first imam of Shia Islam and fourth caliph of Sunni Islam who moved the capital of the early caliphate from Medina to Kufa two decades after the death of Muhammad. Today, Shia Muslims make up around 55% of the Iraqi population. Iraq is the location of the holy cities of Najaf and Karbala, pilgrimage sites for millions of Shia Muslims.