There was in the olden days a great Rishi, named Vibhavasu, who was of exceedingly angry disposition. He had a younger brother, named Supratika, a great ascetic.
आसीद्विभावसुर्नाम महर्षिः कोपनो भृशम्। भ्राता तस्यानुजश्चासीत्सुप्रतीको महातपाः॥