In the Pleistocene era, in the middle of the formation of the land of Bangladesh, the land formed in this region by the sandy soil of the Ganga River of the Bengal delta and the settlement of people continued to grow. Although there is no significant information about the prehistoric period, the first human settlement was developed in this area in the second millennium BC. In ancient times, people of various ethnic groups started to live in search of a fertile land for livelihood and developed human habitation here. In the anthropological analysis, a Shankar Nation settled in this region in the mix of small sections of different ethnic groups. The Austric influence is much more pronounced in terms of language strains in this region.. According to the writings of Greek and Latin historians, this region was known as Gangaridai, a powerful nation whose capital was Gangarzia.
Pareshnath Majumdar presumed this Gangarajaya belongs to Jessore district, which is mentioned in the history book of Satish Chandra Mitra's Jessore-Khulna. During the extreme development of the Maurzya Empire until 550-200 BC, this region was included in Maurzya Empire. During the kingdom of Samudragupta, this region was in the Samatata kingdom in 340-380 AD. In the Gupta era, the Samatata state is divided into administrative units namely Bhukti, Bisoy, Mandal, Bithi and Gram.
Naming of Shailkupa:
Though there is no significant document about how Shailakupa was named or what is the source of naming, but there are some source of naming in various articles. Many people said that during the reign of Sultan Nasir Uddin Shailkupar was Nasirabad. An ancient mound can be found in the village of Harihara near Shailkupar. It was estimated that it was the house of a powerful Hindu feudal king named Medieval Harihar Raja. During this time, a commander of the dynasty sent an army commander to settle in the area and now settled at Pathanpara near Shailkupar. Then there is the love of Shailabala, daughter of Harihara, with a son of the Pathan tribe. At one stage, the youngster came to the bank of the river to ride with the shayalabala. King Harihara send people in different areas to find the daughter. Shailabala is caught with her boyfriend at the hands of the king's people. When he sent the news to the king, he came to the bank of the Kumar river along with the soldier and could not control angry and killed his daughter with a sword. For this the people named Shailakupa after the name of Shailabala.
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