 The four are considered to be Vishnu-tattva or Vishnu's plenary expansions.It has been also used as one of the names of Lord Shiva.A Daitya princess named Usha, daughter of Bana, fell in love with Aniruddha in her dream as per the artistic description of Chitralekha, a friend of Usha, and had him brought by the magic influence of Chitralekha to her apartments in her father's city of Sonitpura in Assam.