Iranian Revolution
The Iranian Revolution (also known as the Islamic Revolution or 1979 Revolution; Persian
Persian language
Persian is an Iranian language within the Indo-Iranian branch of the Indo-European languages. It is primarily spoken in Iran, Afghanistan, Tajikistan and countries which historically came under Persian influence...

: انقلاب اسلامی, Enghelābe Eslāmi orانقلاب بیست و دو بهمن) refers to events involving the overthrow of Iran's monarchy
Pahlavi dynasty
The Pahlavi dynasty consisted of two Iranian/Persian monarchs, father and son Reza Shah Pahlavi and Mohammad Reza Shah Pahlavi The Pahlavi dynasty consisted of two Iranian/Persian monarchs, father and son Reza Shah Pahlavi (reg. 1925–1941) and Mohammad Reza Shah Pahlavi The Pahlavi dynasty ...

 (Pahlavi dynasty) under Shah
Shāh is the title of the ruler of certain Southwest Asian and Central Asian countries, especially Persia , and derives from the Persian word shah, meaning "king".-History:...

 Mohammad Reza Pahlavi
Mohammad Reza Pahlavi
Mohammad Rezā Shāh Pahlavi, Shah of Iran, Shah of Persia , ruled Iran from 16 September 1941 until his overthrow by the Iranian Revolution on 11 February 1979...

 and its replacement with an Islamic republic
Islamic republic
Islamic republic is the name given to several states in the Muslim world including the Islamic Republics of Pakistan, Iran, Afghanistan, and Mauritania. Pakistan adopted the title under the constitution of 1956. Mauritania adopted it on 28 November 1958. Iran adopted it after the 1979 Iranian...

 under Ayatollah
Ayatollah is a high ranking title given to Usuli Twelver Shī‘ah clerics. Those who carry the title are experts in Islamic studies such as jurisprudence, ethics, and philosophy and usually teach in Islamic seminaries. The next lower clerical rank is Hojatoleslam wal-muslemin...

 Ruhollah Khomeini
Ruhollah Khomeini
Grand Ayatollah Sayyed Ruhollah Musavi Khomeini was an Iranian religious leader and politician, and leader of the 1979 Iranian Revolution which saw the overthrow of Mohammad Reza Pahlavi, the Shah of Iran...

, the leader of the revolution.

Demonstration (people)
A demonstration or street protest is action by a mass group or collection of groups of people in favor of a political or other cause; it normally consists of walking in a mass march formation and either beginning with or meeting at a designated endpoint, or rally, to hear speakers.Actions such as...

 against the Shah commenced in October 1977, developing into a campaign of civil resistance
Civil resistance
The term civil resistance, alongside the term nonviolent resistance, is used to describe political action that relies on the use of non-violent methods by civil groups to challenge a particular power, force, policy or regime. Civil resistance operates through appeals to the adversary, pressure and...

 that was partly secular and partly religious, and intensified in January 1978.