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Bhishma
Devavrata, son of King Shantanu and the river Ganga, the eighth child and the only one she did not drown. Ganga explains that he is the Vasu Dyu, sentenced by Vasishtha to a long human life without wife or children. He is known as Bhishma after his vow.
Sources: The Mahabharata, tr. K. M. Ganguli (1883-96), sections read for the Vedic layer · see Bhishma's web