Simraungadh, (also referred to as Simramapura, Simraongarh or Simroungarh) (/ˈsiːmraʊnɡɜːr/, Devanagari: सिम्रौनगढ) was a fortified city[1] and the main capital of the Karnats of Mithila,[2] founded by its first ruler, Nanyadeva[3] in 1097.

[7] The archaeological site is currently split between Bara district in Nepal in the north and East Champaran in Bihar, India in the south, both falling within the Mithila cultural region.

[12] The last king of the Karnata dynasty, Harisingh Dev didn't show his strength and left the fort as he heard the news of approaching army of the Tughlaq Sultan towards the Simraungarh.

Finally on day 3, the army attacked and entered the huge fort whose walls was tall and surrounded by 7 big ditches.

[9] The Labyrinth and the powerful defence system of the city were well planned to protect from the river floods, and enemies and regulate agriculture from controlled flow of water from the ditches showing the ability of the Kingdom.

During the reign of Rama Singh Deva (r. 1227 - 1285 CE) over Simraungadh, the Tibetan monk Dharmasvamin visited the fortified city in 1236 AD on his way back to Nepal and Tibet from Nalanda.