There was a great devotee named Tvashtri who was the lord of all beings and the chief among gods. Out of pure wrath towards Indra, he created a son with three heads.
त्वष्टा प्रजापति सीद् देवश्रेष्ठो महातपाः। स पुत्रं वै त्रिशिरसमिन्द्रद्रोहात् किलासृजत्॥