He was born in 1882 to the notable Shia jurist, Sayyid Hassan bin Hadi bin Muhammad-Ali al-Sadr in Baghdad.[3] A member of the prominent Sadr family, claiming descent from Muhammad, he received a traditional Islamic education. An active Arab nationalist before World War I, in 1919/20 he founded the nationalist party National Guard (al-Haras al-Watani) and helped organize the Iraqi revolt against the British. Escaping arrest by fleeing to Najd, he subsequently returned to Iraq. He was appointed to the Senate of Iraq, and served as its President from November 1929 to February 1937,[4] and from December 1937 to December 1943.[5]
In January 1948 the signing of the Portsmouth treaty led to the Al-Wathbah uprising and the fall of Salih Jabr's government. As-Sadr became Prime Minister for five months. Though he never returned to executive office, he served as President of the Senate again in 1948.
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