Pushyamitras

Living on the banks of the river Narmada, they are believed to have posed a serious threat to the Gupta Empire during the late period of Kumaragupta I's reign.

[1] The Puranas record thirteen kings of the Pushyamitra dynasty and have been placed in the 3rd century of the Common Era.

Inscription covering the events between 455 and 467 CE emphasize the role of Skandagupta, Kumaragupta's successor, in defeating the Pushyamitras.

[4] By whom, when [Skandagupta] prepared himself to restore the fallen fortunes of (his) family, a (whole) night was spent on a couch that was the bare earth; and then, having conquered the Pushyamitras, who had developed great power and wealth, he placed (his) left foot on a footstool which was the king (of that tribe himself).The Pushyamitras were subjugated by Skandagupta after a long and strenuous fight,[6] as they "had developed great power and many resources in terms of military & wealth".

[6][3] This victory was so memorable & important, we are told in the Bhitari inscription that people sang the songs of his glory in every nook and corner of the empire.

The Pushyamitras lived on the banks of the Narmada River .
Political situation in India in 450 CE.