| 18 Nov 1534 | part of Ottoman Empire | Leaders |
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| 10 Jan 1919 | British rule | Leaders |
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| 11 Nov 1920 | State of Iraq (British protectorate) | Leaders |
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| 23 Aug 1921 | Iraqi Kingdom | Leaders |
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| 3 Oct 1932 | full independence | Leaders |
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| 14 Feb 1958 - 14 Jul 1958 | federation with Jordan (Arab Union) | Leaders |
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| 14 Jul 1958 | Iraqi Republic | Leaders |
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| 20 Mar 2003 | U.S.-U.K. invasion (Baghdad taken 9 Apr 2003) | Leaders |
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| 28 Jun 2004 | sovereignty returned | Leaders |
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| 10 Jan 1919 - 1 Oct 1920 | Sir Arnold Talbot Wilson | Administrator |
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| 1 Oct 1920 - 4 May 1923 | Sir Percy Cox | High commissioners |
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| 4 May 1923 - Oct 1928 | Sir Henry Robert Conway Dobbs | High commissioners |
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| Oct 1928 - 11 Sep 1929 | Sir Gilbert Falkingham Clayton | High commissioners |
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| 3 Oct 1929 - 3 Oct 1932 | Sir Francis Henry Humphrys | High commissioners |
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| 11 Nov 1920 - 23 Aug 1921 | Saiyid Abdul Rahman al-Haydari al-Gaylani (b. 1841 - d. 1927) | Chairman of the Council of State |
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| 23 Aug 1921 - 8 Sep 1933 | Faysal I | Kings |
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| 8 Sep 1933 - 4 Apr 1939 | Ghazi I | Kings |
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| 4 Apr 1939 - 14 Jul 1958 | Faysal II | Kings |
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| 4 Apr 1939 - 1 Apr 1941 | Abdul Ilah (1st time) (regent) | Kings |
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| 1 Apr 1941 - 1 Jun 1941 | Sharaf ibn Rajih al-Fawwaz | Kings |
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| 1 Jun 1941 - 2 May 1953 | Abdul Ilah (2nd time) (regent) | Kings |
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| 14 Jul 1958 - 8 Feb 1963 | Muhammad Najib al-Rubai | Chairman of the Sovereignty Council |
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| 8 Feb 1963 - 13 Apr 1966 | Abdul Salam Arif | Presidents |
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| 13 Apr 1966 - 16 Apr 1966 | Abdul Rahman al-Bazzaz (acting) | Presidents |
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| 16 Apr 1966 - 17 Jul 1968 | Abdul Rahman Arif | Presidents |
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| 17 Jul 1968 - 16 Jul 1979 | Ahmad Hassan al-Bakr | Presidents |
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| 16 Jul 1979 - 9 Apr 2003 | Saddam Hussein | Presidents |
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| 9 Apr 2003 - 7 Jul 2003 | Tommy Franks | Presidents |
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| 7 Jul 2003 - 28 Jun 2004 | John Abizaid | Presidents |
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| 28 Jun 2004 - 7 Apr 2005 | Ghazi al-Yawer | Presidents |
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| 7 Apr 2005 - | Jalal Talabani | Presidents |
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| 11 Nov 1920 - 20 Nov 1922 | Saiyid Abdul Rahman al-Haydari al-Gaylani (s.a.) | Prime ministers |
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| 20 Nov 1922 - 22 Nov 1923 | Abdul Muhsin Bey al-Saadun | Prime ministers |
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| 22 Nov 1923 - 2 Aug 1924 | Jaafar al-Askari (1st time) | Prime ministers |
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| 2 Aug 1924 - 26 Jun 1925 | Yasin al-Hashimi (1st time) | Prime ministers |
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| 26 Jun 1925 - 21 Nov 1926 | Abdul Muhsin Bey al-Saadun | Prime ministers |
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| 21 Nov 1926 - 11 Jan 1928 | Jaafar al-Askari (2nd time) | Prime ministers |
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| 11 Jan 1928 - 28 Apr 1929 | Abdul Muhsin Bey al-Saadun | Prime ministers |
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| 28 Apr 1929 - 19 Sep 1929 | Tawfiq al-Suwaidi (1st time) | Prime ministers |
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| 19 Sep 1929 - 13 Nov 1929 | Abdul Muhsin Bey al-Saadun | Prime ministers |
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| 18 Nov 1929 - 23 Mar 1930 | Ibrahim Naji Bey al-Suwaidi | Prime ministers |
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| 23 Mar 1930 - 3 Nov 1932 | Nuri Pasha as-Said (1st time) | Prime ministers |
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| 3 Nov 1932 - 20 Mar 1933 | Naji Shaukat Bey | Prime ministers |
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| 20 Mar 1933 - 9 Nov 1933 | Rashid Ali al-Gaylani (1st time) | Prime ministers |
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| 9 Nov 1933 - 27 Aug 1934 | Jamil al-Midfai (1st time) | Prime ministers |
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| 27 Aug 1934 - 4 Mar 1935 | Ali Jawdat al-Aiyubi (1st time) | Prime ministers |
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| 4 Mar 1935 - 17 Mar 1935 | Jamil al-Midfai (2nd time) | Prime ministers |
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| 17 Mar 1935 - 30 Oct 1936 | Yasin al-Hashimi (2nd time) | Prime ministers |
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| 30 Oct 1936 - 17 Aug 1937 | Hikmat Sulayman | Prime ministers |
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| 17 Aug 1937 - 25 Dec 1938 | Jamil al-Midfai (3rd time) | Prime ministers |
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| 25 Dec 1938 - 31 Mar 1940 | Nuri Pasha as-Said (2nd time) | Prime ministers |
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| 31 Mar 1940 - 3 Feb 1941 | Rashid Ali al-Gaylani (2nd time) | Prime ministers |
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| 3 Feb 1941 - 13 Apr 1941 | Taha al-Hashimi | Prime ministers |
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| 13 Apr 1941 - 30 May 1941 | Rashid Ali al-Gaylani (3rd time) | Prime ministers |
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| 4 Jun 1941 - 10 Oct 1941 | Jamil al-Midfai (4th time) | Prime ministers |
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| 10 Oct 1941 - 4 Jun 1944 | Nuri Pasha as-Said (3rd time) | Prime ministers |
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| 4 Jun 1944 - 23 Feb 1946 | Hamdi al-Bajaji | Prime ministers |
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| 23 Feb 1946 - 1 Jun 1946 | Tawfiq al-Suwaidi (2nd time) | Prime ministers |
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| 1 Jun 1946 - 21 Nov 1946 | Arshad al-Umari (1st time) | Prime ministers |
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| 21 Nov 1946 - 29 Mar 1947 | Nuri Pasha as-Said (4th time) | Prime ministers |
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| 29 Mar 1947 - 29 Jan 1948 | Sayyid Salih Jabr | Prime ministers |
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| 29 Jan 1948 - 26 Jun 1948 | Sayyid Muhammad as-Sadr | Prime ministers |
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| 26 Jun 1948 - 6 Jan 1949 | Muzahim al-Bajaji | Prime ministers |
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| 6 Jan 1949 - 10 Dec 1949 | Nuri Pasha as-Said (5th time) | Prime ministers |
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| 10 Dec 1949 - 5 Feb 1950 | Ali Jawdat al-Aiyubi (2nd time) | Prime ministers |
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| 5 Feb 1950 - 15 Sep 1950 | Tawfiq al-Suwaidi (3rd time) | Prime ministers |
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| 15 Sep 1950 - 12 Jul 1952 | Nuri Pasha as-Said (6th time) | Prime ministers |
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| 12 Jul 1952 - 23 Nov 1952 | Mustafa al-Umari | Prime ministers |
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| 23 Nov 1952 - 29 Jan 1953 | Nureddin Mahmud | Prime ministers |
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| 29 Jan 1953 - 17 Sep 1953 | Jamil al-Midfai (5th time) | Prime ministers |
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| 17 Sep 1953 - 29 Apr 1954 | Muhammad Fadhel al-Jamali | Prime ministers |
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| 29 Apr 1954 - 4 Aug 1954 | Arshad al-Umari (2nd time) | Prime ministers |
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| 4 Aug 1954 - 20 Jun 1957 | Nuri Pasha as-Said (7th time) | Prime ministers |
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| 20 Jun 1957 - 15 Dec 1957 | Ali Jawdat al-Aiyubi (3rd time) | Prime ministers |
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| 15 Dec 1957 - 3 Mar 1958 | Abdul Wahhab Marjan | Prime ministers |
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| 3 Mar 1958 - 18 May 1958 | Nuri Pasha as-Said (8th time) | Prime ministers |
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| 18 May 1958 - 14 Jul 1958 | Ahmad Mukhtar Baban | Prime ministers |
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| 14 Jul 1958 - 8 Feb 1963 | Abdul Karim Kassem | Prime ministers |
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| 8 Feb 1963 - 18 Nov 1963 | Ahmad Hassan al-Bakr (1st time) | Prime ministers |
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| 20 Nov 1963 - 6 Sep 1965 | Tahir Yahya (1st time) | Prime ministers |
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| 6 Sep 1965 - 21 Sep 1965 | Arif Abdul Razzak | Prime ministers |
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| 21 Sep 1965 - 9 Aug 1966 | Abdul Rahman al-Bazzaz | Prime ministers |
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| 9 Aug 1966 - 10 May 1967 | Naji Talib | Prime ministers |
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| 10 May 1967 - 10 Jul 1967 | Abdul Rahman Arif | Prime ministers |
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| 10 Jul 1967 - 17 Jul 1968 | Tahir Yahya (2nd time) | Prime ministers |
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| 17 Jul 1968 - 30 Jul 1968 | Abdul Razzak an-Naif | Prime ministers |
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| 31 Jul 1968 - 16 Jul 1979 | Ahmad Hassan al-Bakr (2nd time) | Prime ministers |
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| 16 Jul 1979 - 23 Mar 1991 | Saddam Hussein (1st time) | Prime ministers |
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| 23 Mar 1991 - 13 Sep 1991 | Saadun Hammadi | Prime ministers |
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| 16 Sep 1991 - 5 Sep 1993 | Muhammad Hamza al-Zubaydi | Prime ministers |
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| 5 Sep 1993 - 29 May 1994 | Ahmad Hussein Khudayir al-Samarrai | Prime ministers |
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| 29 May 1994 - 9 Apr 2003 | Saddam Hussein (2nd time) | Prime ministers |
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| 21 Apr 2003 - 12 May 2003 | Jay Garner Assistance) | Civil administrators |
|---|
| 12 May 2003 - 28 Jun 2004 | Paul Bremer | Civil administrators |
|---|
| 13 Jul 2003 - 31 Jul 2003 | Muhammad Bahr al-Uloum (1st time) | Presidents of the Governing Council (subordinated to the civil administrator) |
|---|
| 1 Aug 2003 - 31 Aug 2003 | Ibrahim al-Jaafari | Presidents of the Governing Council (subordinated to the civil administrator) |
|---|
| 1 Sep 2003 - 30 Sep 2003 | Ahmad Chalabi | Presidents of the Governing Council (subordinated to the civil administrator) |
|---|
| 1 Oct 2003 - 31 Oct 2003 | Iyad Allawi | Presidents of the Governing Council (subordinated to the civil administrator) |
|---|
| 1 Nov 2003 - 30 Nov 2003 | Jalal Talabani | Presidents of the Governing Council (subordinated to the civil administrator) |
|---|
| 1 Dec 2003 - 31 Dec 2003 | Abdul Aziz al-Hakim | Presidents of the Governing Council (subordinated to the civil administrator) |
|---|
| 1 Jan 2004 - 31 Jan 2004 | Adnan Pachachi | Presidents of the Governing Council (subordinated to the civil administrator) |
|---|
| 1 Feb 2004 - 29 Feb 2004 | Mohsen Abdul Hamid | Presidents of the Governing Council (subordinated to the civil administrator) |
|---|
| 1 Mar 2004 - 31 Mar 2004 | Muhammad Bahr al-Uloum (2nd time) | Presidents of the Governing Council (subordinated to the civil administrator) |
|---|
| 1 Apr 2004 - 30 Apr 2004 | Massoud Barzani | Presidents of the Governing Council (subordinated to the civil administrator) |
|---|
| 1 May 2004 - 17 May 2004 | Ezzedine Salim | Presidents of the Governing Council (subordinated to the civil administrator) |
|---|
| 17 May 2004 - 1 Jun 2004 | Ghazi al-Yawer | Presidents of the Governing Council (subordinated to the civil administrator) |
|---|
| 1 Jun 2004 - 3 May 2005 | Iyad Allawi | Prime ministers |
|---|
| 3 May 2005 - 20 May 2006 | Ibrahim al-Jaafari | Prime ministers |
|---|
| 20 May 2006 - | Nuri al-Maliki | Prime ministers |
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