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Expanded History

History of Iran

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

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Overview

Members of the Achaemenid royal bodyguard, from a bas-relief at Persepolis THE ISLAMIC REVOLUTION in 1979 brought a sudden end to the rule of the Pahlavi dynasty, which for fifty years had been identified with the attempt to modernize and Westernize Iran. The Revolution replaced the monarchy with an Islamic republic and a secular state with a quasi-theocracy. It brought new elites to power, altered the pattern of Iran’s foreign relations, and led to the transfer of substantial wealth from private ownership to state control. There were continuities across the watershed of the Revolution, however; bureaucratic structure and behavior, attitudes toward authority and individual rights, and the arbitrary use of power remained much the same. In 1987, nearly a decade after the Revolution, it was still too early to determine whether the continuities--always striking over the long sweep of Iran’s history--or the changes would prove the more permanent. The Revolution ended a pattern of monarchical rule that, until 1979, had been an almost uninterrupted feature of Iranian government for nearly 500 years. The tradition of monarchy itself is even older. In the sixth century B.C., Iran’s first empire, the Achaemenid Empire, was already established. It had an absolute monarch, centralized rule, a highly developed system of administration, aspirations of world rule, and a culture that was uniquely Iranian even as it borrowed, absorbed, and transformed elements from other cultures and civilizations. Although Alexander the Great brought the Achaemenid Empire to an end in 330 B.C., under the Sassanids (A.D. 224-642) Iran once again became the center of an empire and a great civilization. The impact of the Islamic conquest in the seventh century was profound. It introduced a new religion and a new social and legal system. The Iranian heartland became part of a world empire whose center was not in Iran. Nevertheless, historians have found striking continuities in Iranian social structure, administration, and culture. Iranians contributed significantly to all aspects of Islamic civilization; in many ways they helped shape the new order. By the ninth century, there was a revival of the Persian (Farsi) language and of a literature that was uniquely Iranian but was enriched by Arabic and Islamic influences. The breakup of the Islamic empire led, in Iran as in other parts of the Islamic world, to the establishment of local dynasties. Iran, like the rest of the Middle East, was affected by the rise to power of the Seljuk Turks and then by the destruction wrought first by the Mongols and then by Timur, also called Tamerlane (Timur the Lame). With the rise of the Safavids (1501-1732), Iran was reconstituted as a territorial state within borders not very different from those prevailing today. iran/ir_glos.asp#Shia">Shia (see Glossary) Islam became the state religion, and monarchy once again became a central institution. Persian became unquestionably the language of administration and high culture. Although historians no longer assert that under the Safavids Iran emerged as a nation-state in the modern sense of the term, nevertheless by the seventeenth century the sense of Iranian identity and Iran as a state within roughly demarcated borders was more pronounced. The Qajars (1795-1925) attempted to revive the Safavid Empire and in many ways patterned their administration after that of the Safavids. But the Qajars lacked the claims to religious legitimacy available to the Safavids; they failed to establish strong central control; and they faced an external threat from technically, militarily, and economically superior European powers, primarily Russia and Britain. Foreign interference in Iran, Qajar misrule, and new ideas on government led in 1905 to protests and eventually to the Constitutional Revolution (1905-07), which, at least on paper, limited royal absolutism, created in Iran a constitutional monarchy, and recognized the people as a source of legitimacy. The rise of Reza Shah Pahlavi, who as Reza Khan seized power in 1921 and established a new dynasty in 1925, reflected the failure of the constitutional experiment. His early actions also reflected the aspirations of educated Iranians to create a state that was strong, centralized, free of foreign interference, economically developed, and sharing those characteristics thought to distinguish the more advanced states of Europe from the countries of the East. This work of modernization and industrialization, expansion of education, and economic development was continued by the second Pahlavi monarch, Mohammad Reza Shah Pahlavi. He made impressive progress in expanding employment and economic and educational opportunities, in building up strong central government and a strong

Historical Eras

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

  1. Achaemenid & Early Empires

    559 BCE – 224

    Cyrus the Great founded the Achaemenid Empire in 550 BCE, establishing the ancient world's largest realm, stretching from the Aegean to Central Asia. Alexander the Great's conquest in 330 BCE ended Achaemenid rule, giving way to the Seleucid and then Parthian dynasties. This era defined Iranian imperial tradition, administrative sophistication, and Zoroastrian religious culture.

  2. Sasanian Empire

    224 – 642

    The Sasanian dynasty restored Iranian imperial grandeur, reviving Zoroastrianism as a state religion and centralizing administration across a vast empire rivaling Rome and Byzantium. Sasanian art, architecture, and governance reached remarkable heights, influencing cultures far beyond Iran's borders. The empire ultimately collapsed under the Arab Muslim conquest in 642 CE, marking a civilizational turning point.

  3. Islamic & Mongol Eras

    642 – 1501

    The Arab conquest introduced Islam and absorbed Iran into the Abbasid Caliphate, yet Persian language, literature, and administrative traditions proved resilient and enriched Islamic civilization broadly. The Seljuk Turks, Genghis Khan's Mongol invasions of 1220, and Timur's campaigns brought successive waves of destruction and political fragmentation. Local Iranian dynasties periodically reasserted Persian cultural identity throughout this turbulent period.

  4. Safavid Dynasty

    1501 – 1736

    Shah Ismail I founded the Safavid dynasty in 1501 and declared Twelver Shia Islam the state religion, forging a distinct Iranian religious and national identity that endures today. The Safavids restored Iran as a coherent territorial state within borders broadly resembling modern Iran, with Isfahan as a magnificent imperial capital. The dynasty declined through internal weakness and Afghan invasions, ending with Nadir Shah's seizure of power in 1736.

  5. Qajar & Constitutional Era

    1796 – 1925

    The Qajar dynasty reunified Iran but struggled against Russian and British imperial encroachment, ceding significant territory and sovereignty through unequal treaties. Popular frustration with misrule and foreign interference culminated in the Constitutional Revolution of 1905–07, which established a parliament and limited royal absolutism. The era ended when Reza Khan, a Cossack officer, seized power and founded the Pahlavi dynasty in 1925.

  6. Pahlavi & Islamic Republic

    1925 – present

    Reza Shah and his son Mohammad Reza Shah pursued aggressive modernization and Westernization, but mounting authoritarianism and social tensions fueled the 1979 Islamic Revolution that replaced the monarchy with a theocratic republic under Ayatollah Khomeini. The new government faced immediate crises including the U.S. Embassy hostage crisis and the devastating 1980–88 Iran-Iraq War. Since then, Iran has navigated international isolation, internal demands for reform, and ongoing tensions between clerical authority and a restive, demographically young population.

Timeline Preview

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

  1. 559 BCE – 332 BCE

    The Achaemenian Dynasty & the Great Persian Empire

    The Achaemenian Dynasty & the Great Persian Empire. The Persian Empire became the dominant world power for over two centuries.

  2. 550 BCE

    Cyrus the Great established the First World Empire

    Cyrus the Great established the First World Empire.

  3. 525 BCE

    Persians conquer Egypt

    Persians conquer Egypt.

  4. 332 BCE

    Alexander the Great conquered Egypt and Persia

    Alexander the Great conquered Egypt and Persia.

  5. 247 BCE – 224

    The Parthians conquered the Seleucids

    The Parthians conquered the Seleucids.

  6. 224 – 642

    The Sasanian Dynasty

    The Sasanian Dynasty.

  7. 570

    The Prophet Mohammad was born

    The Prophet Mohammad was born.