Lalitha Sahasra Namavali

Hayagreeva taught him the most holy 1000 names of Lalitha

This stotra (hymn which praises) occurs in Brahmanda purana (Old epic of the universe) in the Chapter on discussion between Hayagreeva and Agasthya.Hayagreeva is an incarnation of Vishnu with the horse head and is believed to be the storehouse of knowledge. Agasthya is one of the great sages of yore who is one of the stars of the constellation great bear. At his request Hayagreeva taught him the most holy 1000 names of Lalitha .