Imam Imam Askari (A.S)
His mother was Sulail (or Hudaitha) who was a slave of the 10th Imam whom he had freed and subsequently married. The 10th Imam said of her that she was one who was free from all vice and pollution and that she was one of the righteous ones. After the 11th Imam's martyrdom he left all the "orders" of Imamate with her (his mother).
Once when Imam Hasan Al-Askery (A.S.) was a young child he fell into a well near their house. His father Imam Ali An-Naqi (A.S.) was praying and didn't even notice the commotion around him of the ladies crying. When he finished praying and asked what had happened, he was told. He went towards the well. The water rose and all saw the 11th Imam sitting peacefully on the water and playing.
Bahlool once saw the young Imam crying in the street where all the other children were busy playing with their toys. He asked whether Imam was crying because he had no toys to play with. Imam replied: "We have not been created to play!"
The 10th and 11th Imamayn were both called Al-Askery as they lived in an area of Samarra called Askery.
Another reason that the 11th Imam was called Askery is said to be that once Mutawakkil wanted to show the Imam the strength of his army of 90,000 men and so he asked his men to fill their sacks with sand and pile all the sacks up. He then showed Imam this mountain of sacks. Imam asked Mutawakkil, to look through his (Imam's) two fingers, where he saw a an army of armed Angels. Imam told him that they were at his disposal but he would not use them. (An army is called Askery).
Ahmed Bin Ishaq relates that when he heard of the death of the 10th Imam he went to Samarra and asked for the whereabouts of the 11th Imam. He was told that Imam had been imprisoned by Mo'taz Billah. After bribing the guards he was able to visit Imam one night. He described the prison as a tunnel under the Khalifa's home where there was no space to stretch ones legs nor room to be able to stand. Ahmed says he cried when he saw Imams condition. Food was only one glass of water and a piece of dry bread a day.
He was imprisoned because all the rulers knew of the justice that was promised to come with the coming of the 12th Imam and they wished to prevent anyone being born of the 11th Imam.
Whilst in prison he told his companions to accumulate all the masails of Fiqh and he completed the masails on the chapters that were found missing. He introduced the institution of "Taqleed" advising people to follow those who were learned, "Muttaqi", and just, as he was in prison and it was extremely difficult for people to meet him. Khums was collected through his representative and masails too asked to him, Abu-Ja'fer Uthman bin Saeed, who was later to become the representative of the 12th Imam.
There was once a severe drought in Samarra and a Christian priest came who whenever he raised his hands caused rain to fall from the heavens. The Muslims faith started wavering and the Khalifa Mo'taz Billah got worried for if they left Islam he would have none to rule over.
Imam then prayed for rain and it rained. Mo'taz could not re imprison Imam for some time for when the people saw the miracle they all wanted to visit Imam and asked where they might find him. Imam pointed to the Khalifa and asked them to ask him. Mo'taz told them that Imam was staying at the house where the 10th Imam used to reside.