Imam Ali b.Muhammad al-Hadi (AS):
828 A.D was born in Sarya near near Medina to Imam Jawad (AS) and Samana.
835 A.D His father, Imam Jawad (AS), was martyred.
835 A.D The period of his leadership (Imamate) started in Medina, due to his vast knowledge and deep wisdom despite his young age.
846 A.D His son, Imam Hasan al-Askari (AS) was born.
848 A.D Was summoned by Ali-Mutawakkil, the Abbasid caliph of the time, to Samarra, Iraq, where he lived for about twenty years and was revered by people for his great personality and spirit.
848 - 868 A.D Educated people about Islamic matters, and cleared many doubts and misunderstanding, taught many issues through his supplications, trained many scholars.
868 A.D Was poisoned and martyred by al- Mu'tazz al- Abbasi in Samarra,Iraq.