Anasūyā, the wife of Atri Muni, gave birth to three very famous sons — Soma, Dattātreya and Durvāsā — who were partial representations of Lord Viṣṇu, Lord Śiva and Lord Brahmā. Soma was a partial representation of Lord Brahmā, Dattātreya was a partial representation of Lord Viṣṇu, and Durvāsā was a partial representation of Lord Śiva.