The above image is from a sculpture on the pillars of the Cheluva Narayan temple, Melkote, Karnataka.
Hayagriva, the god with a horse face is considered as an avatar of Vishnu. The Lord took this form to rescue the vedas from the demons, Madhu and Kaitabha. Therefore, Hayagriva is considered the God of wisdom and knowledge. Marichi, is the consort of Hayagreeva.