Gayatri Mantra in the context of "Mantra"

Vishvamitra (Sanskrit: विश्वामित्र, IAST: Viśvāmitra) is 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.

Before renouncing his kingdom and royal status, Brahmarishi Vishvamitra was a king, and thus he retained the title of Rajarshi, or 'royal sage'.

The third Mandala of the Rigveda has 62 hymns, mainly to Agni and Indra. It is one of the "family books" (mandalas 2-7), the oldest core of the Rigveda, which were composed in early Vedic period (1500 – 1000 BCE). Most hymns in this book are attributed to Viśvāmitra Gāthinaḥ.

The verse 3.62.10 gained great importance in Hinduism as the Gayatri Mantra.

Gayatri (Sanskrit: गायत्री, IAST: Gāyatrī) is the personified form of the Gayatri Mantra, a popular hymn from Vedic texts. She is also known as Savitri, and holds the title of Vedamata ('mother of the Vedas'). Gayatri is the manifestation of Saraswati and is often associated with Savitṛ, a solar deity in the Vedas, and her consort in the Puranas is the creator god Brahma.Gayatri is also an epithet for the various goddesses and she is also identified as "Supreme pure consciousness".