Behula (Assamese: বেউলা; Bengali: বেহুলা) is the protagonist in the Shiva Purana and the Manasamangal genre of Bengali medieval epics. A number of works belonging to this genre were written between the thirteenth and eighteenth centuries. Though the religious purpose of these works is to eulogise the Hindu goddess Manasa, these works are more well known for depicting the love story of Behula and her husband Lakhindar (or Lakshindar or Lakshmindara).
Usha (or Usa), the daughter of Banasura, fell in love with Aniruddha the son of Pradyumna. Aniruddha was grandson lord Krishna. After their marriage they were reborn again as Behula and Lakshindar in next life and married each other again.
Behula was the daughter-in law of Chand Sadagar of Champaknagar. According to myth, two beautiful apsara's of the kingdom of heaven, Usha and Aniruddha were cursed by Gods as per the plan of Goddess Manasa and sent to earth as Behula and Lakshinder - Behula as the only daughter of Say bene (or Sayven of Ujaninagar) and Lakshinder as the seventh son of Chand Sadagar.
Chand sadagar was a great devotee of Shiva and for certain reasons he hated Manasa. But Manasa had to get "Anjali" by Chand sadagar's right hand- the Bhaktasreshto to get position of Goddess in the heaven.However, Chand sadagar promised to himself that he will never give anjali to Manasa by the hand he uses to give anjali to Shiva. To get an anjali from Chand, Manasa took away his six sons. They died from poisonous snake bites and Manasa had absolute power over all snakes. These deaths infuriated Chand Sadagar even more and he vowed to save his last son, Lakhinder, in any way possible. Chand found a girl, Behula, whose destiny spoke that she will never be a widow. Chand got his seventh son, Lakshinder married with Behula. Chand also had an iron palace built without any hole so that not a single snake could enter the house.
Bishyakarma made it for the wedding night of Behula and Lakshinder. But due to the request of Manasa, Bishyakarma kept a hole in the palace. The night came and Manasa sent her Kalnagini, the most poisonous snake, to the iron palace and it crept into the room. Behula fell asleep due to a spell Manasa cast on her. When Kalnagini was going to bite Lakshinder, she saw that Behula had committed no sin for which she might be given such a harsh punishment. So kalnagini, with the help of the lower end of her body smeared the parting of Behula's hair with the oil of the lamp, which was a sin according to the Hindu mythology. After she bit Lakshinder, Lakshinder shouted aloud. Behula woke up and saw kalnagini slithering out of the room. In anger, she threw the jaanti towards kalnagini and the lower part of the snake's body was cut off. Kalnagini was not eager to bite Lakshinder; Manasa forced her to do so.