Once upon a time, the Gods of all realms conduct a Mahayajna- a large ritualistic gathering in Triveni Sangama which was presided over by Shiva- the Mahadev himself. Prajapati Daksha visits this event and claiming that he didn’t receive enough respect from Shiva (Ishwara), later arranges a Yajna crafted to defame his son-in-law Shiva and Dakshayani.
Dakshayani notices masses of people and creatures and gets to know about the great event of “DakshaYajna” at her parents. Despite opposition from Shiva, she arrives there without invitation only to know the truth of the situation; ashamed and angry she burns her body in her Yoga-agni.
Shiva upon learning of the death of his wife smashes his matted hair to the earth in a fierce dance (PralayaTandava) from which ‘Veerabhadra’ is born; he then goes on to destroy Daksha. Upon submission, Daksha is revived with a goat’s head and Yajna Narayana appears upon completion of the ritual, blessing the world; he declares the Hari-Hara Tatva – the non-duality of Gods