When Lord Shiv lost Devi Sati .

Devi Sati, believing that her husband(Lord Shiv) had been humiliated by her father, she immolated herself in a fire born of righteous anger .Shiva stood up with such a terrible shock .He uncontrollably cries "no", mad with grief. He placed her charred body on his shoulders and began the dance of destruction .Then Lord Vishnu used Sudarshan chakra which made 51 pieces of Devi Sati's body and it fell to earth and became sacred places, Shakti Peethas.