Shantanu, the king of Hastinapur, was married to Ganga (personification of the Ganges) with whom he had a son called Devavrat. Several years later, when Devavrat had grown up to be an accomplished prince, Shantanu fell in love with Satyavati. Her father refused to let her marry the king unless the king promised that Satyavati's son and descendants would inherit the throne. Unwilling to deny Devavrat his rights, Shantanu declined to do so but the prince, on coming to know of the matter, rode over to Satyavati's house, vowed to renounce the throne and to remain celibate throughout his life. The prince then took Satyavati home to the palace so that the king, his father, could marry her. On account of the terrible vow that he'd taken that day, Devavrat came to be known as Bheeshm. Shantanu was so pleased with his son that he granted to Devavrat the boon of choosing the time of his own death.
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