law: Indian Divorce Act, 1869 
  19. Grounds of decree 
  Such decree may be made on any of the following grounds,- 
  (1) that the respondent was important at the time of the
  
  marriage and at the time of the institution of the suit;
  (2) that the parties are within the prohibited degrees of
  
  consanguinity (whether natural or legal) or affinity;
  (3) that either party was a lunatic or idiot at the time of the
  
  marriage;
  (4) that the former husband or wife of either party was living
  
  at the time of the marriage, and the marriage with such former husband or wife
  
  was then in force.
  Nothing in this section shall affect the jurisdiction of the
  
  High Court to make decrees of nullity of marriage on the ground that the
  
  consent of either party was obtained by force or fraud.