Lit-Pol era Belarus notes (ie circa ~1730s)

The Belarusian Greek Catholic Church / Belarusian Byzantine Catholic Church; Byzantine Rite in communion with Rome (rather than the Orthodox Church).
Polonized ruling class / Szlachta mostly Roman Catholic.

http://en.wikipedia.org/wiki/Belarusian_history_in_the_Russian_Empire
http://en.wikipedia.org/wiki/Litvin
http://en.wikipedia.org/wiki/Szlachta

http://www.gallowglass.org/jadwiga/SCA/slavic/slavicfood.html <- Polish/Russian food in the 1600s. Potatoes only introduced in 1840 (source) though tomatoes may have been around then. Of note is the Little Ice Age in the 1500s.

http://faculty.history.wisc.edu/sommerville/351/351-103.htm