Aśvaśirā (Aswasira) was one of the forty Asura(s) born of the womb of Danu, daughter of Dakṣa (Daksha), and sired by Father Kaśyapa (Kasyapa). In the age of the Pāṇḍava (Pandava) and Kaurava(s), he was reborn as a king of Kekaya. In the Aṁśāvataraṇa (Amsavatarana) upaparva (sub-section) of Mahābhārata (Mahabharata), it is mentioned that Aśvaśirā was one of those five Asura(s) of the ancient kalpa, reincarnated as kings of the land of Kekaya.