There was a state in Kosala.
Vaidyanath said that Ayodhya was the capital of the Kosala Empire.
The emperors of Kosala and the prince of Kasi are other examples.
The RigVeda refers to an
Asura(powerful king) named Rama but makes no mention of Kosala.
Nishadha was connected to Dasarna and Kosala as well as with Vidarbha through trade routes.
According to Vedic texts, Kosala was the biggest and most powerful kingdom ever in history.
In the epic period this area was known as‘Karapath', which was a part of Kosala state.
According to these texts, Kosala was the most powerful and biggest kingdom ever in the recorded history.
After Prasenjit, the kingdom of Kosala began to decline rapidly
and the history of this area is shrouded in obscurity.
Kasi and Kosala were mutually at war for long and at the initial
stage although Kasi fared well but ultimately Kosala became victorious.
It came to be the biggest and the most important of the autonomous states of Kosala in respect of territorial extent and political influence.
Finally, in his life, Emperor Ram divided the Kosala kingdom into many small states and handed over
the rule of this region to his son Kush.
In Hindu belief, the Ganges River came to earth from the heavens,
where it flowed through sacred lands until an Indian king of Kosala, Bhagirath, pleaded with Lord Brahma,
a powerful god, to bring the river to earth.