Yemelyan Mikhailovich Korneev (1782 – no earlier than 1839) was a Russian engraver, draftsman, and traveler, a master of landscape painting. He was an academician of historical painting from 1807. Korneev's works on the peoples of the Russian Empire, their folk costumes, rituals, and crafts, created during his travels, constitute valuable ethnographic material.
The Grebensky Cossacks are an ethnosocial group of Cossacks who lived in the Northeastern Caucasus: initially in the eastern foothills of the Greater Caucasus (part of modern-day Northern Dagestan), later in the eastern Ciscaucasia, along the middle reaches of the Terek River. (part of modern-day Chechnya – Shelkovskoy District), and, probably, for some time, in the eastern regions of Kabarda (part of modern-day Ingushetia). The ancestors of the Grebentsy appeared in this region by the 16th century; their community was formed from the Don Cossacks (also known as Ryazan and Volga Cossacks), as well as from fugitive peasants fleeing enslavement by the Russian state. Until the 20th century, the Cossacks adhered to the Old Believers of the Orthodox Church.
About grebensky kossack in Russian see Russian Wikipedia.
Full information in Russian about E.Korneev see in Wikipedia under following link:
https://ru.wikipedia.org/wiki/Корнеев,_Емельян_Михайлович
Inscription: titled in the middle in Russian and in French; inscribed: drawing by E.Korneev, lower left and etcher A.Manz lower right.
Technique: aquatinting color, matted and framed.
Measurements: only image w 7 1/4" x h 9 1/8" (18,5 x 23 cm), matted nd framed 14 1/2" x 16 1/8" (37 x 41 cm).
Condition: good.