Vishnupurana 3.6.17

3.6.17

sumatiś cāgnivarcāś ca mitrāyuḥ śāṃśapāyanaḥ
akṛtavraṇo 'tha sāvarṇiḥ ṣaṭ śiṣyās tasya cābhavan //

Accomplished in the purport of the Puráńas, Vyása compiled a Pauráńik Sanhitá, consisting of historical and legendary traditions, prayers and hymns, and sacred chronology. He had a distinguished disciple, Súta, also termed Romaharshańa, and to him the great Muni communicated the Puráńas. Súta had six scholars, Sumati, Agnivarchas, Mitrayu, Śánśapáyana, Akritavrańa, who is also called Káśyapa, and Sáverńi. The three last composed three fundamental Sanhitás; and Romaharshańa himself compiled a fourth, called Romaharshańika. The substance of which four Sanhitás is collected into this (Vishńu) Puráńa.