Imam Hasan (as) was born in Medina in c. 625. he was born in the Islamic months Ramadan, though most early works give his birthdate as 15 Ramadan 3 AH (2 March 625 CE),  which is annually celebrated by the Shia. Imam Hasan was the firstborn of Holy Prophet Muhammad's daughter Fatima (as) and his cousin Ali(as).