In the beginning of Creation, Brahmā (Brahma) started tapasyā (tapasya, ascetic practice) to get a son like himself. God Nīlalohita was born out of this tapasyā. After the birth, he started crying loudly, and Brahmā named him ‘Rudra’. Afterwards, he gave seven other names to Nīlalohita (Nilalohita). The seventh among these names, is Ugra. As per Purāṇa (Purana), The Ugra-self of Nīlalohita Śiva is also his manifestation as yajñakartā (yajnakarta, one who performs the yajna) or yajamāna (one who gets the yajna performed). Dīkṣā (Diksha) was the wife of this yajñakartā Śiva. They had a son called Santāna (Santana).