Current area of this district was a part of 'Koshal rajya'- a prime centre of ancient 'arya culture' surrounded by Himalaya in north, Shyandika river in south, 'Panchal rajya' in west & Maghadh rajya in (Bihar) east.
Before Mahabharat times,this area was related with Chakravorty Samrat 'Mahasudtsan' & his kingdom 'kushinagar' was well developed & prosperous.Nearby to his rajya border was the thick area woods 'Maha-van'.