Dharmanagar sub-division is one of the most prominent sub-division of Tripura. Now a mere sub-division, it was once the capital of Tripura and its size was about 450 square miles.
Most of the history of Dharmanagar is derived from the "Rajmala" which is an ancient royal chronicle of the Kings of Tripura, written in Bengali since the 14th century AD. Initially, but unrecorded it was in circulation in Kokborok language, the language of the Tripura Kings before it was translated to Bengali in the 14th century.
The original of the name 'Dharmanagar' cannot be accurately traced back in time. The 'Rajmala' refers to at least four kings whose names include the word 'Dharma'. So it remains a matter of speculation as to which king had lent his name to our hometown. The various documents however, indicate that the existence of Dharmanagar goes back deep into time. "Rajmala" further indicates that the name 'Faticuli' was used to mean Dharmanagar back in those ancient times. It is not irrelevant to quote Pandit Kaliprasanna Sen and Pandit Likhan Ghosh from the 'Rajmala ancient scripts as they were edited and translated to Bengali by them.
The exact geographical boundaries of Dharmanagar in the ancient times, have not been clearly documented. However, a general idea about the size obtained from various source indicate that's one major position of Sylhet (now in Bangladesh) were include in Dharmanagar. Sources indicate that Dharmanagar in those days was not as small as it is today.
At present Dharmanagar is bound by Maulvi Bazar and Karimganj Subdivision of Sylhet in the north; Karimganj district of Assam in the east; Kailashahar subdivision and Mizoram state in the south and Kailashahar and Maulvi Bazar subdivision of Bangladesh in the west. The size of Dharmanagar has been greatly diminished over the ages and what was once the mighty capital of Tripura has now been reduced to a sub division of the state.
Remains of some old structures found in and around Dharmanagar bear testimony to the ancient glory of Dharmanagar . Certain ruins of old brick and mud structures . Were once seen in various places such as Rajbari, Kalacherra, Lalcherra etc. Today Dharmanagar shows the old glamour and glory. But it is still a very vibrant commercial town, which acts as a gateway to Tripura. Private endeavors in various walks of public life have enriched the place and have made the place a really cool place to be in. At present the town is moving towards modernity at a good pace and hopes to increase mutual interaction with the rest of the world.