
His Birth and blessings
The 4th Imam after Imam Hussain(a.s.) was his son Imam Ali Zain-al-Abideen(a.s.). His mother was Bibi Shahar Bano who was a princess from Persia, the daughter of the Kind Yazd Gard II. She was brought as a prisoner of war during the caliphate period of mam Ali(a.s.) during 31 A.H. and Imam Ali(a.s.) got her freed and married her to Imam Hussain(a.s.). Imam Zain-al-Abideen was born from this wedlock. She, however, died within 10 days of the birth of Imam Sajjad(a.s.).
His title Zain-al-Abideen was granted to him by the Holy Prophet(pbuh&hf) himself who mentioned that on the day of judgement a call for Zain-al-Abideen will be made and my son Ali bin al-Hussain(a.s.) will responde to the call saying "Labbaik"....