kausamvy

It's the capital of 8th state "Vatsa" in ancient India.It had a monarchical form of government with its capital at Kaushambi (whose ruins are located at the modern village of Kosam, 38 miles from Allahabad).Udayana was the ruler of Vatsa in the 6th-5th century BCE, the time of the Buddha. His mother, Mrigavati, is notable for being one of the earliest known female rulers in Indian history.The Vatsas were a branch of the Kuru dynasty. During the Rig Vedic period, the Kuru Kingdom comprised the area of Haryana/ Delhi and the Ganga-Jamuna Doab, till Prayag/ Kaushambi, with its capital at Hastinapur. During the late-Vedic period, Hastinapur was destroyed by floods, and the Kuru King Nicakṣu shifted his capital with the entire subjects to a newly constructed capital that was called Kosambi or Kaushambi. In the post Vedic period, when Arya Varta consisted of several Mahajanpads, the Kuru Dynasty was split between Kurus and Vatsas. The Kurus controlled the Haryana/ Delhi/ Upper Doab, while the Vatsas controlled the Lower Doab. Later, The Vatsas were further divided into two branches—One at Mathura, and the other at Kaushambi.
The Puranas state that after the washing away of Hastinapura by the Ganges, the Bhārata king Nicakṣu, the great-great grandson of Janamejaya, abandoned the city and settled in Kauśāmbī.The deity in this capital is Goddess Durga,Shiva etc.