Viśvāmitra

Vishvamitra is a legendary figure in Hindu mythology, and one of the most venerated rishis or sages of ancient India. Vishvamitra is one of the seven Brahmarshi. According to Hindu tradition, he is stated to have written most of the Mandala 3 of the Rigveda, including the Gayatri Mantra (3.62.10). The Puranas mention that only 24 rishis since antiquity have understood the whole meaning of —and thus wielded the whole power of — the Gayatri Mantra. Vishvamitra is supposed to have been the first, and Yajnavalkya the last.