Question: The Prime Minister of Iran was a political post in Iran that had existed during several different periods of time starting with the Qajar era (when the country was internationally known as Persia) until its most recent revival from 1979 to 1989 following which 1979 events involving the overthrow of the Pahlavi dynasty under Mohammad Reza Shah Pahlavi, who was supported by the United States, and eventual replacement of 2500 years of Iranian monarchy with an Islamic Republic regime?

<P0-S0> The Prime Minister of Iran was a political post in Iran that had existed during several different periods of time starting with the Qajar era (when the country was internationally known as Persia) until its most recent revival from 1979 to 1989 following the Iranian Revolution. <SEP> <P1-S0> Sayyid Ruhollah Mūsavi Khomeini (Persian: سید روح‌الله موسوی خمینی‎ ‎ ] ; 24 September 1902 – 3 June 1989), known in the Western world as Ayatollah Khomeini, was an Iranian Shia Muslim religious leader, philosopher, revolutionary, and politician. <P1-S1>  He was the founder of the Islamic Republic of Iran and the leader of the 1979 Iranian Revolution that saw the overthrow of the 2500 years of Persian monarchy and Mohammad Reza Pahlavi, the last Shah of Iran. <P1-S2>  Following the revolution, Khomeini became the country's Supreme Leader, a position created in the constitution of the Islamic Republic as the highest-ranking political and religious authority of the nation, which he held until his death. <P1-S3>  He was succeeded by Ali Khamenei on 4 June 1989. <SEP> <P2-S0> Sayyed Hasan Taqizādeh (Persian: سید حسن تقی‌زاده‎ ‎ ; September 27, 1878 in Tabriz, Iran – January 28, 1970, in Tehran, Iran) was an influential Iranian politician and diplomat, of Azeri origin, during the Qajar dynasty under the reign of Mohammad Ali Shah, as well as the Pahlavi dynasty under the reign of Reza Shah and Mohammad Reza Shah. <P2-S1>  Although in the modern political history Taqizadeh is known as a secular politician, who believed that "outwardly and inwardly, in body and in spirit, Iran must become Europeanized", he came from a traditional Islamic Sayyed-family (descendant of Muhammad). <P2-S2>  His father, Sayyed Taqi, was a clergyman and when Sayyed Hasan became a mullah, it seemed likely that he would follow in his father's footsteps. <P2-S3>  From an early age Taqizadeh showed interest in enlightened ideas and the Western concept of constitutionalism. <P2-S4>  This interest can be traced back to the socio-political sphere in which Taqizadeh became an adult. <P2-S5>  He grew up in Tabriz, the capital city of East Azerbaijan province, which was the gateway to the modern and progressive ideas coming from Russia and especially Western Europe. <P2-S6>  In the time of World War I, World War II and after, Taqizadeh was the most influential person in Iran who support intress of German Empire against Russia and Britain. <SEP> <P3-S0> The Iranian Revolution (Persian: انقلاب ایران‎ , "Enqelāb-e Iran " ‎ ; also known as the Islamic Revolution or the 1979 Revolution;) refers to events involving the overthrow of the Pahlavi dynasty under Mohammad Reza Shah Pahlavi, who was supported by the United States, and eventual replacement of 2500 years of Iranian monarchy with an Islamic Republic regime under the Grand Ayatollah Ruhollah Khomeini, the leader of the revolution, supported by various leftist and Islamist organizations and student movements.