Vyasa child Pandu
Niyoga and birth of Vichitravirya's sons
Shantanu and Satyavati had two sons, named Chitrāngada and Vichitravirya. Both of them died early without leaving an heir, but Vichitravirya had two wives - Ambika and Ambalika. A widowed Satyavati initially asked her stepson, Bhishma, to marry both the queens, but he refused, citing his vow of celibacy. Satyavati revealed her secret past and requested him to bring her firstborn to impregnate the widows under a tradition called Niyoga. By this time, Vyasa had compiled the Vedas.
Sage Vyasa was unkempt because of months of meditation in the forest. Hence upon seeing him, Ambika who was rather scared shut her eyes, resulting in their child, Dhritarashtra, being born blind. The other queen, Ambalika, turned pale upon meeting Vyasa, which resulted in their child, Pandu, being born pale. Alarmed, Satyavati requested that Vyasa meet Ambika again and grant her another son. Ambika instead sent her maid to meet Vyasa. The duty-bound maid was calm and composed; she had a healthy child who was later named Vidura.
offspring progeny issue descendant heir