A sage who observed correctly the आश्रम of वानप्रस्थ . He was one of the ब्रह्मवादी sons of विश्वामित्र . [mh-13-4-50 ] Mahābhārata • Anuśāsana parva . विश्वामित्र had a hundred sons like मधुच्छन्दस् . (10th Skandha, Bhāgavata) . The first सूक्त of ऋग्वेद was written by this sage.