In Vanaparva of of Mahābhārata (Mahabharata), Maharṣi (Maharshi; great sage) Aṣṭāvakra (Ashtavakra) has addressed Rājarṣi (Rajarshi) Janaka as Ugrasena. It is to be noted that in Purāṇa (Purana; Mythological Scripture), all kings belonging to the lineage of Nimi , are called ‘Janaka’. Janaka is the family name of this royal dynasty. The name of the king to whom Maharṣi Aṣṭāvakra talked, was perhaps Ugrasena. However, Nīlakaṇṭha (Nilakantha), the commentator of Mahābhārata, has taken the term Ugrasena as an adjective. A king, who is the ruler of an army full of terrible energy, is called Ugrasena. However, according to Pargiter, Ugrasena was not an adjective, it was the name of that king belonging to Nimivaṃśa (Nimivamsa; the jineage of Nimi).