Other names: Dhrustadyuman, Dhrustadyumna, Dhrishtadyumna
Dhristadyumna was the son of the Panchal King Drupad and the brother of Draupadi and Shikhandi. The king of Panchal, Drupad, undertook a Putrakami Yagna, a sacrifice to please the gods and obtain offspring by their blessing. Drupad wanted a son who could kill Drona, who had humiliated him in battle and taken half his kingdom.
With the help of two Brahmins, Drupad undertook the sacrifice. After his wife made the sacrificial offerings, Dhristadyumna emerged from the fire, a fully grown, powerful, young man, fully armed, together with his sister Draupadi.
Even though he was the prophesied killer of Drona, he was in fact accepted as a student by Drona, and he learnt the advanced military arts.
In the past, Guru Dronacharya and King Drupad had been classmates. After he became the King, Drupad had insulted poor Dronacharya by refusing to recognize him as his Guru-bhai. To take revenge for this, after having taught archery to the Kauravas and Pandavas, Droncharya asked for his Guru Dakshina (an honorarium as a teacher):
the Pandavas should tie up Drupad, bring him over and drop him on the ground in front of Drona. So, the Pandavas tied Drupad up and brought him to Drona, as he requested. Dhrustdhuman was very angry with this insult to his father and he too immediately became the enemy of Dronacharya.
During the war of Mahabharata, Dhristadyumna fought as the army chief on behalf of the Pandavas. His father Drupad also fought on the side of the Pandavas. In the war, Drona killed Drupad. From that moment, Dhristadyumna had made up his mind to kill Dronacharya.
During the war, after Dronacharya had heard the “news” from Yudhishthir about his son Ashwathama’s “death”, he had sat down, apathetic and indifferent to everything around him. Dhristadyumna took this opportunity and beheaded him.
After the war of Mahabharata, one night, when the Pandavas were away from their camp, and Dhrustdhruman and sons of the Pandavas were sleeping,
Ashwathama attacked their camp and killed all the sons of the Pandavas by Draupadi, in order to take revenge for the death of his father Dronacharya. Ashwathama was furiously angry and so he also took the opportunity to revenge himself on Dhrustdhruman and killed him by crushing him.