,  Likhita ,  Manu , [17]   Parasara ,  Samvarta ,  Shankha ,  Shatatapa ,  Ushanasa ,  Vashista ,  Vishnu ,  Vyasa ,  Yajnavalkya ,  Yama . These twenty-one rishis were the propounders of  Smritis . The oldest among these smritis are Apastamba, Baudhayana, Gautama, and Vashista Sutras . [18] Provide