The capital of Gangpur State was modern Sundargarh of Western Odisha.

According to tradition, the dynasty was established by Gangadhar Sekhar Deo, a scion of the Sekhar dynasty from Sikharbhum near the Singhbhum region of Eastern India with the help of the dominant local Bhuyan clans.

Written archival records point to the reign of Indra Shekhar Deo under whom the region formally became a part of the British Empire after the defeat of the Marathas in the Second Anglo-Maratha War.

[8] On 1 January 1948 the last ruler of Gangpur signed the document of accession to the Indian Union after independence, following which it merged with the state of Odisha, forming a part of the Sundergarh district.

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