Imam Hasan (a.s.) was born on the 15th of Ramazan in the 3rd Hijrah. His name was suggested by Allah (swt) through a Vahi (revelation) to the Prophet Mohammad (saw) which suggested that since Imam Ali (a.s.) is to the Prophet Mohammad (saw) as Hazrat Haroon (a.s.) was to Hazrat Moosa (a.s.), the name of his child should be on the name of the son of Hazrat Haroon (a.s.) which was Shabbar – meaning Hasan in Arabic. This was the first time that a child was named Hasan.
“Islam did not rise except through Ali’s sword and Khadija’s wealth,” a saying goes. Khadija al-Kubra daughter of Khuwaylid ibn (son of) Asad ibn Abdul-`Uzza ibn Qusayy belonged to the clan of Banu Hashim of the tribe of Banu Asad. She was a distant cousin of her husband the Messenger of Allah Muhammad ibn Abdullah ibn Abdul-Muttalib ibn Hashim ibn Abd Manaf ibn Qusayy, Allah’s peace and blessings be upon him and his progeny. Qusayy, then, is the ancestor of all clans belonging to Quraysh.