[1] They were part of the tribal confederation of the "peak caps" or the "black hats" (the Chorni Klobuky, in Turkic karakalpak).
The Berindeis are mentioned in the chronicles of the Kievan Rus' in the 11th and 12th centuries as "Chornye Klobuki" and, together with the Pechenegs and Uzs, became settled along the borders of the Russian steppes.
Most of the Berindeis remained on the territories of the Kiev and Pereyaslavl principalities, where they functioned as cavalry troops in the region of the lower Dnieper river.
The rest of these tribes mixed with the nomad population of the Golden Horde, where after, the historians at this time ceased with the usage of the Berindei tribal name.
[3] In modern-day Romania, the Berindeis were documented to have lived in Teleorman County, around the town of Roșiorii de Vede together with the Pechenegs, Uzs, and Cumans.