Parātaṃsa
Parātaṃsa is a king of the Candra line in the Dvāpara Yuga. The Pratisarga Parva of the Bhavishya Purāṇa gives him as the son of Prataṃsa and the father of Ayataṃsa.
Source: Bhavishya Purāṇa, Pratisarga Parva, Khaṇḍa 1, Chapter 3
