Drupad, son of king Prishata was the king of Panchal.
He was the father of Draupadi,the Pandavas wife.
Drupada, and Drona studied together in Rishi Baradwaj’s gurukul.He was also Drona’s father.
They became great friends.
While Drupada became a king after the death of his father, Drona lived a life of poverty,he approached Drupada for help. Drupada, now conscious of the status between them, refused to acknowledge Drona’s friendship,saying that a king can only have friend with another king.
Drona was later employed by Bhishma to train the sons of Pandavas and kauravas.
After the gurukul period,Drona asked the princes to defeat and capture Drupada,as Gurudakshina.
Then the Pandavas and Kauravas led by Arjun defeated Drupada,and brought him to Drona.
Drona considering their friend forgave Drupada and set him free, and gave him half of the country to rule so that they are equals.
Drupada felt humiliated.
Drupada performed a great yajna called for a son who could slay Drona.
From the fire of the yajna, twins Dhrishtathyumn and Draupadi, (who married Arjun later) were born.
Drona accepted him as his student and taught him everything.
Later during the Kurukshetra war Drona killed Drupada who fought on Pandavas side.
Dhristathyumn beheaded Drona,when he was meditating.