The first of the so-called seven buddhas of the past, Vipaśyin is said to have lived in this world ninety-one eons (kalpas) ago. His career is discussed at length in the Mahāpadāna-suttanta (Dīghanikaya, no. 14) and more briefly in the Buddhavaṃsa. Despite his prominence in the list of seven, Vipaśyin does not appear to have become a major cultic figure.
Horner, I. B., trans. The Minor Anthologies of the Pāli Canon, Part 3: Buddhavaṃsa and Cariyapiṭaka. London: Pāli Text Society, 1975.
Walshe, Maurice, trans. Thus Have I Heard: The Long Discourses of the Buddha. London: Wisdom Press, 1987.