King Shantanu and Satyawati
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One day while training a new horse,Shantanu saw an enemy king coming with a large force to invade Hastinapur.Dev Vrat challenged him and captured the enemy prince and presented him before his father. King Shantanu was indeed very happy with his promising son.

The king was having a stroll on the bank of Ganga when he saw an extremely charming maiden.He was fascinated by her beauty.Her name was Satyawati,daughter of local fisherman.When the king asked him for the hand of his daughter,he(Satyawati's father) put forward a condition that the son born to Satyawati should be the successor to the Kaurava throne.

Disappointed and unhappy,the king returned to his palace.Dev Vrat came to know of his father's plight and told Satyawati's dad that he would give up his right to the throne. Dev Vrat also promised that he would not marry all his life(Thus there will not be any of his heirs for the throne).Then Dev Vrat,seating Satyawati in his chariot,brought her to the palace.

When king Shantanu saw Satyawati coming to the palace he was all praises for his son as he had gone out of way to fulfill his desire.Before long,Satyawati disclosed all what happened between Dev Vrat and her father. Hearing of the horrible pledge taken by Dev Vrat in order to please his dear father,the king felt shocked.
Unconsciously the words-Ek Bhisma Pratigya(a most horrible pledge)-escaped his lips and he was plunged in profound grief.

From that day on ,Dev Vrat came to be known as Bhishma.