Imam Khomeini had lived many years in exile, in Iraq and France, before returning home and leading a historical revolution that overthrew Pahlavi regime on February 11, 1979.
The 10-day period from the return of Imam Khomeini until the revolution’s victory is celebrated annually in Iran, and is known as the Ten-Day Fajr (Dawn).
The day of Imam Khomeini's return to Iran marks the beginning of the Ten Days of Dawn, which culminates with the anniversary of the victory of the Islamic Revolution on February 10.