The state was founded by Raja Niladri Bebarta Patnaik in 1178 and had its capital in Athgarh (Athagad) town.

Athgarh is alleged to have originally extended on the east as far as Parganas Cuttack and Dalijora, on the west up to Tigria princely state, on the north from Kapilas to Gobindpur, Baldiaband, Nadiali, Krishnaprasad and Pachimeshwar temple and on the south to Banki, Dompara, Matri and Patia.

[5] It's reported that there was a succession struggle in the ruling house of Athgarh after the death of Raja Bhagirathi Patnaik in the year 1893 between his uterine brother Raghunath Samanta and his illegitimate son Srinath Gambit Samanta.

[8] During the British Raj, Athgarh was one of the Feudatory States of Orissa and acceded to India following the independence of India when the last ruler Raja Radhanath Bebarta Patnaik signed the accession to the Indian Union on 1 January 1948.

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