The Pahlavi dynasty was the last ruling house of the Imperial State of Iran (Persian: کشور شاهنشاهی ایران, romanized: Kešvare Šâhanšâhiye Irân) from 1925 until 1979, when the Persian monarchy was overthrown and abolished as a result of the Iranian Revolution. The dynasty was founded by Reza Shah Pahlavi in 1925, a former brigadier-general of the Persian Cossack Brigade, whose reign lasted until 1941 when he was forced to abdicate by the Allies after the Anglo-Soviet invasion of Iran. He was succeeded by his son, Mohammad Reza Pahlavi, the last Shah of Iran. The Pahlavis came to power after Ahmad Shah Qajar, the last Qajar ruler of Iran, proved unable to stop British and Soviet encroachment on Iranian sovereignty, had his position extremely weakened by a military coup, and was removed from power by the parliament while in France. The Iranian parliament, known as the Majlis, convening as a Constituent Assembly on 12 December 1925, deposed the young Ahmad Shah Qajar, and declared Reza Khan the new King (Shah) of Imperial State of Persia. In 1935, Reza Shah asked foreign delegates to use the endonym Iran in formal correspondence and the official name the Imperial State of Iran was adopted. Following the coup d'état in 1953 supported by United Kingdom and the United States, Mohammad Reza Pahlavi's rule became more autocratic and was aligned with the Western Bloc during the Cold War. Faced with growing public discontent and popular rebellion throughout 1978 and after declaring surrender and officially resigning, the second Pahlavi went into exile with his family in January 1979, sparking a series of events that quickly led to the end of the state and the beginning of the Islamic Republic of Iran on 11 February 1979.