At about 8th or 10th century AD, five Kulin Brahmin came to Bengal from Kanyakubja ( Uttar Pradesh) at the invitation of a King, named AdiShur. Bhattanarayan was the son of Kshitish of Sandilya Gotra
. Din, son of Bhattanarayan, received a gift of land at Kushgram in the district of Burdwan, and got the surname Kushari giving up his own title Bandyapadhayaya. After the 8th or 10th generation, Jagannath was born. Daksha was the first person in the clan of the Roychoudhurys of the Kashyap Gotra. Dakshinanath, born after 12th generation of Daksha, had three sons. Sukdev, Kamdev and Joydev. Amongst them Kamdev and Joydev were forcibly converted to Islam by a Mahammadan. Sukdev, though he did not convert, maintained his relationship with Kamdev and Joydev, later known as Kamaluddin and Jamaluddin, and became known as Pir-Ali Brahmin, meaning boycotted Brahmin. Any Brahmin with any kind of relation with Sukdev would come to be termed a Pir-Ali Brahmin. Jagannath Kushari married a daughter of Sukdev and was gifted land at Dakshindihi of Khulna district and began to live there. Jagannath Kushari, thus having entered a matrimonial relationship with Sukdev, also became known as Pir-Ali Brahmin. After a few generations, Panchanan was born in the the Kushari family. But due to some family troubles, Panchanan along with his uncle Sukdev came by boat on the Ganges to a place known as Govindapur. Some fishermen lived there. Panchanan and his uncle were the only Brahmins there and the fishermen, respectfully, called them 'Thakur', a name later pronounced as 'Tagore' by Europeans. Henceforth, Panchanan and his uncle became known as Thakur, giving up their surname, Kushari. Panchanan Kushari became known as Panchanan Thakur. But they followed the rites and customs of Kulin Brahmins in the case of marriage or any other social function. Provat Mukhopadhyaya, in his book Rabindra Jiban Katha, wrote that during marriage they had to search for girls from Jessore or Khulna. Even Rabindranath was married to Bhabatarini, later known as Mrinalini, the daughter of one of the clerks of the Tagore family of Khulna district who was also a Pir-Ali Brahmin. Panchanan used to supply goods to the captains of the Ships. His son Joyram earned a great deal of money in this way. He became a surveyor of the East India Company. Joyram died on 1756.
