According to the Vāyupurāṇa (Vayupurana) in the twelfth dvāpara (dwapara) epoch when the great sage Śatateja (Shatateja) would become Vyāsa (Vyasa), the compiler of the Vedas, Śiva (Shiva) would take the avatāra (avatar) of Atri (Atri) to descend into the mortal world.