Ten-Day Fajr (Ten-Day Dawn), starts on February 1, ten days before the victory of the Islamic Revolution, marking the return of the late founder of the Islamic Revolution Ayatollah Ruhollah Khomeini to Iran.

On February 1, 1979, Ayatollah Ruhollah Khomeini, the late founder of the Islamic Revolution returned to Iran after 15 years in exile.

Ayatollah Sayyed Ruhullah Mousavi Khomeini was a Muslim cleric and Marja, and the political leader of the 1979 Islamic Revolution of Iran which overthrew Mohammad Reza Pahlavi, the last Shah (king) of Iran.

Imam Khomeini was considered a Marja-e taqlid to many Muslims, and in Iran was officially addressed as Imam rather than Grand Ayatollah; his supporters adhered to this convention. Imam Khomeini was also a highly influential and innovative Islamic political theorist, most noted for his development of the theory of velayat-e faqih, the "guardianship of the jurisconsult."