Shiva knows as Devo k Dev Mahadev, but do you know why? and Brahma the creator of the planet and nature is not superior than Shiva. We don’t know the exact reason so I had decided to find the answer and so what I get is. Why Shiva is greater than Brahma. Who is Bhairov? And where is kalalmochan?
One time all the Devta went to Sumera Mountain to meet Brahmaji. they were asking him about indestructible matter, as Brahmaji unaware from Shiva illusion and indestructible matter. He explains to devtas by saying that , I am only who created all of you and earth, nature,unborn, i am only the god ,suprem being spirit.
While all this Vishnu who was present told Brahma ji that you are wrong, you are only the creator of this universe and nature. By disrespecting me you are making yourself great. Like this there was a difference between Brahma and Vishnu started and they want to correct them self so they started a counter question with each other, After they decided to ask the questions from the Vedas. All the answers are end up with Shiva, Shankar and Shiv. This answer was given by Vishnu ji.
While going all this conversation between Vishnu and Brahma. A source of energy or can say light come up there between them, which was endless and Shiva come over there and Brahma explain the matter to him after hearing all this Shiva become angry and from Shiva there was another form of him called Bhairav, revealed there and back cut 5th head of Brahma,Vishnu and Brahma understand and stop fighting and counter conversation with each other. Brahma accepted that he is not superior than shiva as his pride and coxcombry is removed from his body and his mind. Other hand Bhairav was feeling guilty, because he cut down the head of Brahma so he decided to go Kashi, for discharge himself from guiltiness to cut down the head of Brahma.
When Bhairav reach Kasi, CHIMTA which was in his hand got fallen down and KAPAL on earth and take a bath in the Ganga, form that day kasi is also known as KAPALMOCHAN. From that time people started to bury the body and take the ashes to Kasi for the discharge of the spirit and mukti of their family member.