 Sadhayāpurī (or Svadhayāpurī) or Sadiya was the name of the kingdom as well its capital.It became the dominant power in eastern Assam in the 12th century and remained so until the 16th century with its domain from Parshuram Kund in the east to Vishwanath in the west.The founder of the Chutia kingdom was Birpal who claimed descent from a legendary king named "Bhirmukka" and reigned in 1189.