In the Mahabharat, Karna, though born of Kunti, mother of
Pandavas, was abandoned on birth and he was brought up by a charioteer and as
such considered as a charioteer’s son. Karna became the friend of Duryodhana
and Kauravas as they gave him social and political status, which was long
denied to him.
After training in arms, Kauravas and Pandavas were given an
arena to display their talent. Karna arrived there and insisted on
participating and challenging Arjuna who was considered as a great archer.
However, people raised objection to his participation
stating that he was not of royal blood and was the son of mere charioteer.
Duryodhana was looking for someone who could challenge Arjun.
He found an ideal candidate in Karna. He ceased the opportunity and declared
Karna as the king of the Anga territory.
Thus, Karna got the right to fight in the tournament
arranged for royal blood.
This one act got Duryodhana the lifelong support of Karna.