Salastambha dynasty ruled Kamrupa from seventh to Tenth century A.D. The accurate boundary of their kingdom is debatable. But the erstwhile Darrang was certainly a part of the kingdom. They shifted their capital from Pragjyotishpur to Haruppeswara, or Hatappeswara- the present day Tezpur. The famous King of the dynasty Harjjar Varma, besides other things had excavated a large pond in 70 acres of land, later came to be known as Hajara Pukhuri ( Harjjara Pukhuri ).Pal dynasty ruled Haruppeswara till the 12th century. The most famous ruler of the Pal dynasty was Brahmapal.