The history of the city of Bettiah is inextricably linked with the Bettiah Raj—one of the largest and most influential feudal estates (Zamindari) in what is now India. The city served as the capital of this powerful princely state, which determined its development for many centuries. The estate was founded in the 17th century by Udayne Singh, a member of a Rajput clan, though the roots of the ruling lineage go back even further, to approximately the 13th century. The city itself began to develop actively as an administrative center, and in the second half of the 17th century, Raja Gaj Singh built his palace here, solidifying Bettiah's status as the capital.
The city's political status played a key role in its formation. As the center of a vast estate covering nearly two thousand square miles, Bettiah was responsible for tax collection and maintaining order over extensive territories. Initially, the princely state was subordinate to the Mughal Empire, and after 1764, it came under the influence of the British East India Company, while retaining its regional significance. The city's economy was based on the trade of agricultural products, and during the colonial period, indigo plantations flourished here. Additionally, crafts developed, particularly the production of brass and leather goods. The rulers of Bettiah were known as patrons of the arts, education, and religion, supporting the construction of schools and contributing to the cultural development of the region.