Comilla is a city in south-eastern Bangladesh, located along the Dhaka-Chittagong Highway. It is the administrative center of the Comilla District, part of the Chittagong Division. The Eastern Wing of Bangladesh Highway Police is located in Comilla. The Comilla region was once under ancient Samatat and was joined with Tripura State. This district came under the reign of the kings of the Harikela in the ninth century AD.