BHAIRAVAN:

Brahma, the Creator, lusted after his mind-borne daughter, and grew four heads in order that he might continually see her. In creating these four heads, Brahma divided the world into the four directions, due to his desire for that which no longer was within himself. It is said by some that Brahma's desire for his daughter was caused by Kama (desire) who was born to madden and delude people, a task for which Brahma gave him magical arrows, which he immediately tested upon the Creator himself. Embarrassed by the attentions of Brahma, his daughter, who is known by many different names, ascended heavenwards. This provoked Brahma to manifest a fifth head, the quintessence of the other four, and reached out to 'cohabit' with his daughter. Upon seeing this, Shiva cut off the fifth head of Brahma with his sword (in some versions of the myth Bhairava merely uses the nail of his left thumb).In this act of murder, Shiva-Bhairava became 'Kapalin' or skull-carrier,The skull of Brahma's fifth head became stuck to his hand and although himself a god, Shiva-Bhairava had to somehow expiate his sin and, in order to do so, Bhairava became the Supreme Beggar, the archetype of the Kapalika, who is divine, yet debased. Bhairava took upon himself the Kapalika vow, which was to wander the world, begging alms, until the skull fell from his hand. It was whilst he was wandering through a great forest that Bhairava encountered a group of ascetic sages.