Vaisampayana

Vaishampayana is the traditional narrator of the Mahabharata, one of the two major Sanskrit epics of India.
He was one of Vyasa's four main disciples. His nephew and disciple, Yajnavalkya, who was also a well-known sage.

Legend

Vaishampayana is a renowned sage who is stated to be the original teacher of the Krishna Yajur-Veda:
The Ashvalayana Grihya Sutra mentions him as Mahabharatacharya. He is also mentioned in the Taittiriya Aranyaka and the Ashtadhyayi of Pāṇini.
Vyasa is regarded to have taught the Mahabharata of 100,000 verses to Vaishampayana. He is regarded to have recited the epic to King Janamejaya at his sarpa satra. The Harivamsha Purana is also recited by him, where he narrates the legend of Prithu's emergence from Vena.