Hayagriva — “the Horse-Necked One” — is a fierce, horse-headed wrathful deity of Tibetan Buddhism: a powerful dharma-protector and meditational deity whose neighing horse-cry shatters delusion and subdues the forces of evil, the wrathful emanation of the compassion of [avalokiteshvara]. He is among the most important of the wrathful protective deities.
The Horse-Necked Deity
Hayagriva is depicted as a fierce, usually red wrathful deity, his most distinctive feature being one or more horse-heads emerging from his fiery hair atop his human (but terrible) face — the small green or white horse-head (or three of them) neighing above his crown. He is wreathed in flames, fanged and wrathful, wielding weapons and trampling the forms of evil. The horse-head and the horse’s neigh are his signature: it is said that his thunderous neighing pierces and shatters all delusion, terrifies and subdues the demonic forces, and pervades the universe.
The Wrath of Compassion
Like the other great wrathful deities, Hayagriva is not an evil being but an emanation of enlightened compassion in fierce form — specifically, he is regarded as a wrathful manifestation of [avalokiteshvara], the bodhisattva of compassion. His ferocity is the dynamic, overwhelming power of compassion turned against the obstacles, demons, and inner defilements that gentle means cannot overcome. He is invoked especially against disease, against malevolent spirits and black magic, and against the obstacles to the dharma; his power is held to be particularly effective in subduing the most stubborn and dangerous of evils.
The Protector and the Yidam
Hayagriva is both a dharma-protector and an important meditational deity (yidam) in his own right, his practice undertaken to overcome obstacles, dispel negativity, and protect against harm. His origins reach back to the Indian Hayagriva (an avatar of Vishnu), but in the Buddhist context he was transformed into this fierce protector and compassionate wrathful deity, and he is honoured across the Tibetan and East Asian Buddhist worlds. In Hayagriva, Tibetan Buddhism gave form to the shattering power of compassionate wrath — the horse-necked deity whose neighing pierces all delusion and subdues all evil, the fierce emanation of the bodhisattva of compassion, protector against disease, demons, and the obstacles to enlightenment.