With the rise of the illustrious and mighty Nala rulers in the 3rd century A.D. Maraguda valley emerged as the classic capital city of Kosal and thrived for centuries with prosperity.
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In the light of the reference of the Chinese pilgrim, Maraguda valley has been identified as the capital city of Kosal country.
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circuit area having excellent religious institutions, magnificent residential apartments, massive fortification and efflorescent palace complex, as the majestic imperial metropolis with acropolis and seat of cultural culmination of Kosal kingdom.
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In the Mahabharata and Ramayana it was known as Kantara or Mahakantara which later on finds mention in the historical record of Allahabad pillaring scription of Samudragupta.
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Hiuen Tsang who extensively traveled in India from 630-645 A.D. narrates that from Kalinga, he went north-west by hills and woods for about 1800 li to reach Kosal country which was 6000 li in circuit, surrounded by marshes and mountains with its capital city 40 li or 10 km in circuit.
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Many scholars have identified the site as capital city of Kosal Kingdom referred to by Hiuen Tsang.