The chief legend of Baidyanath Jayadurga relates to the creation of the Shakti Peethas. Sati, the daughter of Prajapati Daksha, was married to the god Shiva versus his wishes. Daksha arranged a great yajna but did not invite Sati and also Shiva. Uninvited, Sati reached the yajna-site, where Daksha ignored Sati as well as Shiva.
Sati was not able to withstand this insult. So, Devi Sati gave her life by jumping into the fire of Havan organized by her father King Daksh. When Lord Shiva was running around the planet carrying her body that Lord Vishnu divided the body into 51 parts utilizing his Sudarshan chakra. Out of those 51 parts, from which the ‘Heart’ of Sati fell to this place. This place is also known as Chitabhumi because Lord Shiva cremated Mata Sati’s heart at the same place where it fell.
Baidyanath and Jayadurga are both the Temples are connected by the red threads from their top, and it is believed that if the married couples bind these two tops with silk, they will be blessed with a happy married life.