Who was Ali al-AsgharHe was the youngest son of Imam Hussain and Rubab (the daughter of the chief of the Kinda Imra al-Qays tribe)
He is honoured by all muslims as being the youngest martyr (6 months old) at the battlefield of Karbala.
Abdullah "Ali al-Asghar" ("Youngest Ali") ibn Hussain was born in Medina, and was one of the three sons of Hussain. The other two were Imam Zain ul-Abideen, and Ali Akbar ibn Hussain, who Yazid's forces also killed in the Battle of Karbala. His sister was Sakinah bint Hussain.
On the morning of 10th Muharram
Ali Asgher, fell from the cradle hearing the cry of his father Hussain. Hussain Ibn-Ali was called, and when he came, he saw the thirst that was gradually killing Ali Asgher.
Therefore, he asked permission of his wife who was the mother of Ali-Asgher to take him to the battle field and ask his enemies for water.
Hussain introduced his son Ali-Asgher and asked water for his son. The Army of Yazid was so grieved that they began questioning their belief in Yazeed and his ruling.
Ibn-Zyad, the Commander of the Army of Yazid, ordered Hurmala to kill this child.
Hussain, in seeing this, put Ali-Asgher on the ground and told them that he would not take the water and that they themselves should give this six-month old child water.