The Chutia Kingdom (also Sadiya) was a late medieval state that developed around Sadiya in present Assam and adjoining areas in Arunachal Pradesh. It extended over almost the entire region of present districts of Lakhimpur, Dhemaji, Tinsukia, and some parts of Dibrugarh in Assam, as well as the plains and foothills of Arunachal Pradesh. The kingdom fell in 1523–1524 to the Ahom Kingdom after a series of conflicts and the capital area ruled by the Chutia rulers became the administrative domain of the office of Sadia Khowa Gohain of the Ahom kingdom.
The Chutia kingdom came into prominence in the second half of the 14th century, and it was one among several rudimentary states (Ahom, Dimasa, Koch, Jaintia etc.) that emerged from tribal political formations in the region, between the 13th and the 16th century. Among these, the Chutia state was the most advanced, with its rural industries, trade, surplus economy and advanced Sanskritisation. It is not exactly known as to the system of agriculture adopted by the Chutias, but it is believed that they were settled cultivators. After the Ahoms annexed the kingdom in 1523, the Chutia state was absorbed into the Ahom state — the nobility and the professional classes were given important positions in the Ahom officialdom and the land was resettled for wet rice cultivation.
Though there is no doubt on the Chutia polity, the origins of this kingdom are obscure. It is generally held that the Chutias established a state around Sadiya and contiguous areas—though it is believed that the kingdom was established in the 13th century before the advent of the Ahoms in 1228, and Buranjis, the Ahom chronicles, indicate the presence of a Chutia state the evidence is scarce that it was of any significance before the second half of the 14th century.
The earliest Chutia king in the epigraphic records is Nandin or Nandisvara, from the latter half of the 14th century, mentioned in a grant by his son Satyanarayana who nevertheless draws his royal lineage from Asuras.