Tehran is part of the villages of Rey city, and Rey is known as the mother of Tehran. According to historical monuments and signs, habitation in Tehran has been founded about 7000 years ago.
During the Qajar dynasty, after the battle between Agha Mohammad khan Qajar and Lotf Ali khan Zand and the victory over the last king of Zand range, Tehran was chosen as the capital of Iran by Agha Mohammad Khan Qajar, and A royal and glorious coronation was taken place. At that time, Tehran was expanded in terms of construction and during the time of Fathalishah Qajar reign, historical monuments such as: Imam Khomeini(Shah) Mosque, Aziz Allah Mosque, Mervi Qasr Palace and the Garden of Negarestan and LalehZar were constructed as a result of Caliphate period. In 1275, a team led by E’etezad al-Saltaneh and in collaboration with monsieur karsheish, Artillery Brigadier and instructor, prepared a map from Tehran, following the expansion of Tehran.
Undoubtedly, fundamental changes have been made since the establishment of the kingdom of Reza Shah Pahlavi in Tehran in 1305, including the construction of buildings of the Melli Bank, the Ministry of Foreign Affairs, the polices of the whole country, the railway station and the University of Tehran, along with several hospitals. In 1355, Tehran ranked 11th in the world in terms of construction and technology that the population were over 4,350,000 people at the same time.
The Pahlavi dynasty by its founder, Reza Khan, brought about the growth of the country and made economic, political and social significant changes in Tehran. IRAN was developing European-style educational institutions, a modern economic structure with state-owned factories, communications network, investment banks and chain stores, and traditional women were changing to modern ones. Reza Khan, in the sake of reaching its goals of rebuilding IRAN based on western attitudes, relied on religious rejection, dissemination of tribal attitudes and the spread of nationalism, education, and state capitalism. Among the actions of that period, we can name: national railway course from north to south of the country, construction of Pahlavi road ( Valiasr Street, now), preparation and approval of the first civil law of Iran, establishment of registering the documents and Civil and Personal Status Registration for the sake of the issuance of identity card for each person, general construction in The whole country, the formation of the Iranian army, the founding of Iran insurance, the founding of Radio Iran and the Persia news agency and the Academia of Iran. The official name change of the country from Persia to Iran, the establishment of the Museum of Iran called the Museum of Ancient IRAN, and the reconstruction of historical places of masters and elites of Iranian history. With the occurrence of World War II and from 1320 to 1332, economic and social growth were halted somehow during the reign of Mohammad Reza Shah, the crown prince of Reza Khan. He paid great attention to the economic and political development as well as increase in the military power of the country, and spent most of the oil revenue on the army. Under the name of the White Revolution, he designed economic and social reforms, such as land reform to bring Iran closer to the most modern countries in the world.In the 1940s and early 50s, economic growth was high and led to the establishment of a one-party system in the country. In 1957, under the leadership of Ayatollah Khomeini and by the abolition of the Pahlavi Empire and conversion to the Islamic Republic, Tehran started a new social economic and political era.