The Saur Revolution (Dari: إنقلاب ثور Pashto: د ثور انقلاب‎) (also Sawr Revolution) was a revolution led by the People's Democratic Party of Afghanistan (PDPA) against the rule of self-proclaimed Afghan President Mohammed Daoud Khan on 27–28 April 1978. The government at the time was led by Dauod, who had previously overthrown his cousin King Mohammed Zahir in 1973. 'Saur' is the Dari name of the second month of the Persian calendar, the month in which the uprising took place.