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Expanded History

History of Iraq

From antiquity to the modern era — the historical eras, key events, and narrative that shaped Iraq.

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Overview

Calif’s head that appears as an ornament on golden harp from Ur, ca. 2500 B.C. IRAQ, A REPUBLIC since the 1958 coup d’etat that ended the reign of King Faisal II, became a sovereign, independent state in 1932. Although the modern state, the Republic of Iraq, is quite young, the history of the land and its people dates back more than 5,000 years. Indeed, Iraq contains the world’s richest known archaeological sites. Here, in ancient Mesopotamia (the land between the rivers), the first civilization--that of Sumer-- appeared in the Near East. Despite the millennium separating the two epochs, Iraqi history displays a continuity shaped by adaptation to the ebbings and flowings of the Tigris and Euphrates rivers (in Arabic, the Dijlis and Furat, respectively). Allowed to flow unchecked, the rivers wrought destruction in terrible floods that inundated whole towns. When the rivers were controlled by irrigation dikes and other waterworks, the land became extremely fertile. The dual nature of the Tigris and the Euphrates--their potential to be destructive or productive--has resulted in two distinct legacies found throughout Iraqi history. On the one hand, Mesopotamia’s plentiful water resources and lush river valleys allowed for the production of surplus food that served as the basis for the civilizing trend begun at Sumer and preserved by rulers such as Hammurabi (1792-1750 B.C.), Cyrus (550-530 B.C.), Darius (520-485 B.C.), Alexander (336-323 B.C.), and the Abbasids (750-1258). The ancient cities of Sumer, Babylon, and Assyria all were located in what is now Iraq. Surplus food production and joint irrigation and flood control efforts facilitated the growth of a powerful and expanding state. Mesopotamia could also be an extremely threatening environment, however, driving its peoples to seek security from the vicissitudes of nature. Throughout Iraqi history, various groups have formed autonomous, self-contained social units. Allegiance to ancient religious deities at Ur and Eridu, membership in the Shiat Ali (or party of Ali, the small group of followers that supported Ali ibn Abu Talib as rightful leader of the Islamic community in the seventh century), residence in the asnaf (guilds) or the mahallat (city quarters) of Baghdad under the Ottoman Turks, membership in one of a multitude of tribes--such efforts to build autonomous security-providing structures have exerted a powerful centrifugal force on Iraqi culture. Two other factors that have inhibited political centralization are the absence of stone and Iraq’s geographic location as the eastern flank of the Arab world. For much of Iraqi history, the lack of stone has severely hindered the building of roads. As a result, many parts of the country have remained beyond government control. Also, because it borders nonArab Turkey and Iran and because of the great agricultural potential of its river valley, Iraq has attracted waves of ethnically diverse migrations. Although this influx of people has enriched Iraqi culture, it also has disrupted the country’s internal balance and has led to deep-seated schisms. Throughout Iraqi history, the conflict between political fragmentation and centralization has been reflected in the struggles among tribes and cities for the food-producing flatlands of the river valleys. When a central power neglected to keep the waterworks in repair, land fell into disuse, and tribes attacked settled peoples for precious and scarce agricultural commodities. For nearly 600 years, between the collapse of the Abbasid Empire in the thirteenth century and the waning years of the Ottoman era in the late nineteenth century, government authority was tenuous and tribal Iraq was, in effect, autonomous. At the beginning of the twentieth century, Iraq’s disconnected, and often antagonistic, ethnic, religious, and tribal social groups professed little or no allegiance to the central government. As a result, the all-consuming concern of contemporary Iraqi history has been the forging of a nation-state out of this diverse and conflict-ridden social structure and the concomitant transformation of parochial loyalties, both tribal and ethnic, into a national identity. Beginning in the middle of the nineteenth century, the tanzimat reforms (an administrative and legal reorganization of the Ottoman Empire), the emergence of private property, and the tying of Iraq to the world capitalist market severely altered Iraq’s social structure. Tribal iraq/iq_glos.asp#shaykh">shaykhs (see Glossary) traditionally had provided both spiritual leadership and tribal security. Land reform and increasing links with the West transformed many shaykhs into profit-seeking landlords, whose tribesmen became impoverished sharec

Historical Eras

The major periods of {country}’s history at a glance.

  1. Ancient Mesopotamia

    3500 BCE – 633

    The cradle of civilization, ancient Mesopotamia gave rise to Sumer, Babylon, and Assyria along the Tigris and Euphrates rivers. Innovations in writing, law, and agriculture flourished under rulers such as Hammurabi, Cyrus, and Darius. The region later passed through Achaemenid, Seleucid, Parthian, and Sasanian rule before the Arab-Muslim conquest.

  2. Islamic Caliphates

    633 – 1258

    Arab Muslim forces conquered Iraq in 633, and the region became central to the early Islamic world. The Abbasid Caliphate, founded in 750 and centered in Baghdad, presided over a golden age of science, philosophy, and commerce. Internal strife, Shia revolts, and the Buyid invasion of 945 gradually weakened Abbasid authority before the Mongols sacked Baghdad in 1258.

  3. Mongol & Timurid Era

    1258 – 1534

    The Mongol destruction of Baghdad in 1258 ended the Abbasid Caliphate and devastated Iraq's irrigation infrastructure, triggering prolonged economic and demographic decline. The region fragmented under successive Ilkhanid, Jalayirid, and Timurid overlords, with Timur's campaigns further devastating the population in the late fourteenth century. Tribal autonomy filled the vacuum left by collapsed central authority.

  4. Ottoman Iraq

    1534 – 1917

    Ottoman Sultan Suleiman the Magnificent conquered Iraq in 1533–1534, incorporating it as a contested frontier zone repeatedly fought over with Safavid Persia. Governed through the vilayets of Mosul, Baghdad, and Basra, the region endured weak central control, persistent tribal autonomy, and economic stagnation for much of this period. Late nineteenth-century Tanzimat reforms and the opening of the Suez Canal brought modest modernization and renewed strategic importance.

  5. British Mandate

    1917 – 1932

    British forces occupied Baghdad in 1917 during World War I, and the 1920 San Remo Conference formalized the League of Nations Mandate over Iraq. A major nationalist uprising in 1920 compelled Britain to install the Hashemite King Faisal I in 1921, creating a constitutional monarchy under continued British oversight. Iraq gained formal independence and League of Nations membership in 1932, though British influence and military presence persisted.

  6. Monarchy to Republic

    1932 – 1968

    The Hashemite monarchy navigated coups, pan-Arab nationalism, and the turbulent aftermath of World War II before being overthrown in the 1958 revolution that killed King Faisal II and established the Republic of Iraq. A succession of military governments followed, marked by instability, Kurdish insurgency, and contests between Nasserist, communist, and Baathist factions. The Baath Party briefly held power in 1963 before being ousted, setting the stage for its definitive return.

  7. Baath & Modern Iraq

    1968 – present

    The Baath Party seized power in 1968, and Saddam Hussein consolidated authoritarian rule by 1979, leading Iraq into the devastating Iran-Iraq War (1980–1988) and the Gulf War triggered by the 1990 invasion of Kuwait. The U.S.-led invasion of 2003 toppled Saddam Hussein, disbanding the Baathist state and unleashing prolonged sectarian conflict, the rise and fall of the Islamic State, and an ongoing struggle to build stable democratic governance.

Timeline Preview

The first 7 key events. View the full chronology on the timeline page.

  1. 3500 BCE

    Known as Mesopotamia a region now in southeastern Iraq.

    Known as Mesopotamia, the world’s first civilization developed in Sumer, a region now in southeastern Iraq.

  2. 627

    Byzantine invasion, and the region was weakened politically and economically.

    Byzantine invasion, and the region was weakened politically and economically.

  3. 633

    Muslims conquered Syria and Iraq.

    Muslims conquered Syria and Iraq.

  4. 680

    Tragedy of Karbala

    Tragedy of Karbala (in modern Iraq): Troops from Umayyad caliph Yazid I (645 - 683) murdered Husayn (c. 626 - 680) who, for the Shiites, was really the legitimate successor to the caliphate. This triggered the Shi’i’tes’ open and violent revolt against Umayyad rule, with the anniversary of Husayn’s death becoming a Shi’ite day of mourning.

  5. 685 – 687

    Shi’i’te Muslims staged a revolt in Iraq.

    Shi’i’te Muslims staged a revolt in Iraq.

  6. 747

    Revolt by the Iraqi family Abbasi starts.

    Revolt by the Iraqi family Abbasi starts.

  7. 750

    The Abbasids assumed command of the Islamic world

    The Abbasids assumed command of the Islamic world (except Spain, which fell under the control of a descendant of the Umayyad family) and moved the capital to Baghdad in Iraq.