Warenburg (Варенбург) and Privolnoye (Привольное) are the same place.
http://ru.wikipedia.org/wiki/%D0%9F%D1%80%D0%B8%D0%B2%D0%BE%...
And it is only 25 km from Rovnoye.
https://maps.google.ru/maps?saddr=%D0%A1%D0%B0%D1%80%D0%B0%D...
Both were in the same Samara Gubernia in Russiam Empire.