[1] Extensive remains of buildings and fortifications built during the Chutia rule near Sadiya point to the importance of the region in the past.

Historically Sadiya referred to the Chutiya kingdom which included at times the districts of Lakhimpur, Dhemaji and Tinsukia.

[11] In 1524, the Mongkawng or Nora king Phukloimung attacked Sadiya from what is today Myitkyina District of Myanmar but was defeated and pushed back.

[12] After annexing the Chutia kingdom by Suhungmung Dihingia Roja in 1524, this place came under the domain of the Ahoms and Prasengmung Borgohain was appointed as the governor of the territory or Sadiya Khowa Gohain in 1524.

Domains of Sadiya Khowa Gohain included the rivers of Lohit, Kundil, Dibang, Dikhari and the places of Kankham, Bardeoliyagoan, Nangkoa and the hills of Doidam and Chandangiri.

In 1799, the Khamtis in league with the Phakials, Miris, Mishmis, Muluks, Khanghak, Pani Naras and Abors, created disturbance in Sadiya but were suppressed with harsh measures by Purnananda Burhagohain and were widely dispersed.

[13] In 1799, the Khamtis in league with the Phakials, Miris, Mishmis, Muluks, Khanghak, Pani Naras and Abors, created disturbance in Sadiya but were suppressed with harsh measures by Purnananda Burhagohain and were widely dispersed.

[17] Sadiya was the extreme north-east frontier station of British Raj, in the Lakhimpur district of Eastern Bengal and Assam regions.

There had a bazaar, to which the hill-men beyond the frontier—Mishmis, Abors, and Khamtis—used to bring down rubber, wax, ivory, and musk, to barter for cotton cloth, salt and metal goods.

He finally retired from service in 1905 after spending his life exploring above the Brahmaputra river and writing a treatise on the grammar of Miri, Singpho, and Khamti languages.

The temple was dedicated to Kechaikhati (literal meaning: eater-of-raw-flesh), a primordial female tribal deity commonly found among other groups.

The roof of the Tamreswari temple was originally sheeted with copper as mentioned in the Changrung Phukan Buranji (1711 AD), from which the name is derived.

As per T. Block who visited the site in 1905, this square structure in the corner cannot have been the main building inside the complex and the brick wall evidently enclosed some sort of a grand temple in the center which has disappeared with time.

The ruins of the gateway which remains include the lintel carved on the edge in a chain of lotus flowers, some ornamented small pillars and an elephant statue.

There was another stone gateway at the southeast corner leading to the stream, in the bed of which are several carved and plain blocks of granite and sandstone.

In the floods of 1959, due to deposit of silt in the banks of Paya river the structure was completely submerged in the waters.

It was dedicated to Primordial parents Gira-Girasi or Bura Buri (literal meaning: the-old-ones), which were later sanskritised as Shiva and Sakti.

The name is derived from Bhishmaka of Vidarbha, the Hindu lineage created for the Chutias in the 16th-century Rukmimi-harana by Srimanta Sankardeva.

[38] The Bhismaknagar central complex extended over an area of 1860 square meters and displays three halls, six ingresses and two extension rooms.

Fabricated from the burnt bricks gave this fort an impressive and remarkable top view and thus explores the dexterity of people of ancient era.

[40] The Bhismaknagar central complex extended over an area of 1860 square meters and displays three halls, six ingresses and two extension rooms.

An exploration-cum-excavation work, undertaken by the Research Department of the Government of Arunachal Pradesh, to study the ruins, has thrown some light on the antiquities.

In course of the progress of work, which continued from January 1973 to April 1974, excavation of two mounds at Chimri, II km from Roing, unearthed two rooms, 10x10 m and 10x12 m respectively built on a slope, at a distance of 14 m from each other.

The third site north of Chimri is situated at a high altitude of about 610 m. Not a single brick found there was in alignment, and everything seemed destroyed.

The situation of all the four sites on a hilly terrain suitable for defence indicate that they are parts of a single complex representing a fort which extended from Chidu to Chimri.

Another archaeological site called Duku Limbo is on the left bank of the Dibang at'the foot of Elopa hill.

It was suitable for a small band of soldiers to maintain vigilance against the enemies from their hide-outs inside jungle especially in guerilla warfare, the normal practice in the region.