The name of a legendary Vedic ṛṣi. A number of Vedic hymns and a law code (the Atrismṛti) are attributed to him. He is said to have been the purohita of the early Āryans, and through his connection with the sacrificial fire is credited with immense power. In later mythology, he is identified as one of the Prajāpatis who create the universe. In the Rāmāyaṇa, he and his wife, Anasūyā, are visited in their forest hermitage by Rāma and his companions.