The salmon-fishing people of the Kamchatka River valley — the densest population in the Far East before 1697, and the first to be broken by the Russian advance into the Pacific.
Not an ending: four risings ending in 1741-2 were crushed and smallpox and intermarriage folded most Itelmen into the Russophone 'Kamchadal' population, but some 3,200 people identified as Itelmen in 2010 and the language is being revived.
The eyewitness description of Itelmen life written during the conquest itself (1755 original); the primary source every later account rests on.