About Muḥammad Bāqir aṣ-Ṣadr
Muhammad Baqir al-Sadr (Arabic: محمد باقر الصدر, romanized: Muḥammad Bāqir aṣ-Ṣadr; March 1, 1935 – April 9, 1980), also known as al-Shahid al-Khamis (Arabic: الشهيد الخامس, romanized: al-Shahīd al-Khāmis, lit. 'the fifth martyr'), was an Iraqi Islamic scholar, philosopher, and the ideological founder of the Islamic Dawa Party. He was the father-in-law to Muqtada al-Sadr, a cousin of Muhammad Sadiq al-Sadr and Musa al-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.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.