Mohammad Reza Pahlavi in the context of "Shah"

Historically, Iran was commonly referred to as "Persia" in the Western world. Likewise, the modern-day ethnonym "Persian" was typically used as a demonym for all Iranian nationals, regardless of whether or not they were ethnic Persians. This terminology prevailed until 1935, when, during an international gathering for Nowruz, the Iranian king Reza Shah Pahlavi officially requested that foreign delegates begin using the endonym "Iran" in formal correspondence. Subsequently, "Iran" and "Iranian" were standardized as the terms referring to the country and its citizens, respectively. Later, in 1959, Pahlavi's son Mohammad Reza Pahlavi announced that it was appropriate to use both "Persia" and "Iran" in formal correspondence. A variety of scholars from the Middle Ages, such as the Khwarazmian polymath Al-Biruni, also used terms like "Xuniras" (Avestan: Xvaniraθa-, transl. "self-made, not resting on anything else") to refer to Iran: "which is the center of the world, [...] and it is the one wherein we are, and the kings called it the Iranian realm."

The monarchs of Iran ruled for over two and a half millennia, beginning as early as the 8th century BC and enduring until the 20th century AD. The earliest Iranian monarch is generally considered to have been either Deioces of the Median dynasty (c. 727–550 BC) or Cyrus the Great of the Achaemenid dynasty (550–330 BC). The last Iranian monarch was Mohammad Reza Pahlavi of the Pahlavi dynasty (1925–1979), who was overthrown in the Iranian Revolution. Since then, Iran has been governed by theocratic supreme leaders.

In classical antiquity, Iran reached the peak of its power and prestige under the Achaemenid Empire, which stretched from Egypt and parts of Southeast Europe in the west to the Indus Valley and parts of Central Asia in the east. By 323 BC, the Achaemenid Empire's territories had been conquered by the Macedonian Empire during the Wars of Alexander the Great, bringing Iran into the Hellenistic sphere. In the Wars of the Diadochi, the Seleucid Empire (305–129 BC) assumed control of Iran. Native Iranian rule was revived with the establishment and expansion of the Parthian Empire (247 BC–224 AD) and then the Sasanian Empire (224–651), which existed until the Arab conquest of Iran.

The 1970s (pronounced "nineteen-seventies"; commonly shortened to the "Seventies" or the "'70s") was the decade that began on January 1, 1970, and ended on December 31, 1979.

In the 21st century, historians have increasingly portrayed the 1970s as a "pivot of change" in world history, focusing especially on the economic upheavals that followed the end of the postwar economic boom. On a global scale, it was characterized by frequent coups, domestic conflicts and civil wars, and various political upheavals and armed conflicts which arose from or were related to decolonization, and the global struggle between NATO, the Warsaw Pact, and the Non-Aligned Movement. Many regions had periods of high-intensity conflict, notably Southeast Asia, the Middle East, Latin America, and Africa.

The Iranian Revolution or the Islamic Revolution was a series of events that culminated in the overthrow of the Pahlavi dynasty in 1979. The revolution led to the replacement of the Imperial State of Iran by the Islamic Republic of Iran, as the monarchical government of Shah Mohammad Reza Pahlavi was superseded by Ruhollah Khomeini, an Islamist cleric who had headed one of the rebel factions. The ousting of Mohammad Reza Pahlavi, the last Shah of Iran, formally marked the end of Iran's historical monarchy.

In 1953, the CIA- and MI6-backed 1953 Iranian coup d'état overthrew Iran’s democratically elected Prime Minister, Mohammad Mossadegh, who had nationalized the Anglo-Persian Oil Company. The coup reinstated Mohammad Reza Pahlavi as an absolute monarch and significantly increased United States influence over Iran.

The Pahlavi dynasty (Persian: خاندان پهلوی) was an Iranian royal dynasty that was the last to rule Iran before the country's monarchy was overthrown by the Iranian Revolution in 1979. It was founded in 1925 by Reza Shah Pahlavi, a non-aristocratic Iranian soldier of Mazanderani origin, who took on the name of the Pahlavi scripts of the Middle Persian language from the Sasanian Empire of pre-Islamic Iran. The dynasty largely espoused this form of Iranian nationalism rooted in the pre-Islamic era (notably based on the Achaemenid Empire) during its time in power, especially under its last king Mohammad Reza Pahlavi.

The dynasty replaced the Qajar dynasty in 1925 after the 1921 coup d'état, beginning on 14 January 1921 when 42-year-old soldier Reza Khan was promoted by British General Edmund Ironside to lead the British-run Persian Cossack Brigade. About a month later, under British direction, Reza Khan's 3,000–4,000 strong detachment of the Cossack Brigade reached Tehran. The rest of the country was taken by 1923, and by October 1925 the Majlis agreed to depose and formally exile Ahmad Shah Qajar. The Majlis declared Reza Pahlavi as the Shah of Iran on 12 December 1925, pursuant to the Persian Constitution of 1906. Initially, Pahlavi had planned to declare the country a republic, as his contemporary Mustafa Kemal Atatürk had done in Turkey, but he abandoned the idea in the face of British and clerical opposition.

Ruhollah Musavi Khomeini (17 May 1900 – 3 June 1989) was an Iranian cleric, politician, political theorist, and revolutionary who founded the Islamic Republic of Iran and served as its first supreme leader from 1979 until his death in 1989. He was the main leader of the Iranian Revolution, which overthrew Mohammad Reza Pahlavi and transformed Iran into a theocratic Islamic republic.

Born in Khomeyn, in what is now Iran's Markazi province, his father was murdered when Khomeini was two years old. He began studying the Quran and Arabic from a young age assisted by his relatives. Khomeini became a high ranking cleric in Twelver Shi'ism, an ayatollah, a marja' ("source of emulation"), a mujtahid or faqīh (an expert in fiqh), and author of more than 40 books. His opposition to the White Revolution resulted in his state-sponsored expulsion to Bursa in 1964. Nearly a year later, he moved to Najaf, where speeches he gave outlining his religiopolitical theory of Guardianship of the Jurist were compiled into Islamic Government.