Brest-Litovsk (in Polish, Brzesc) is one of the bigger cities in Belarus. In early modern times it was also known from its famous Jewish kehilla, which was regarded as one of the most influential ones in Lithuania. The Jews from Brest Litovsk were famous as merchants, they traded mostly in honey, furs, wax, wood, but also clothes and Oriental spices; they also frequently acted as tolls- and duties-lessees. Brest-Litovsk's economic importance found its expression in the strong representation of its community on the Lithuanian Council (Vaad Lita) in the first half of the 17th century. Brest Litovsk Diet's (sejmik) records constitute the main archival source for this article. They provide only an incomplete image of the social and ethnic relations in Lithuania in the seventeenth and the first half of the eighteenth century. The Diet's documents shall be confronted with other sources like customs rolls, magnates' correspondence, proclamations of hetmans and other military commanders. In Brest Litovsk's Diet acts are marked by a rather unfavourable attitude towards Jews. The majority of the Diet's legislation concerns various economic matters and the enforcement of the existing laws. The gentry (szlachta) wanted Jews to pay Jewish poll tax (poglówne), but not in lump sums. Execution of Jewish debts was also frequently seen as a remedy for impoverished Brest-Litovsk voivodeship, especially after the wars with Cossacks, Russia and Sweden. Confiscation of the Jewish real estate was also adopted as a protective measure. The extremely high indebtedness of the Jews led the provincial Diet to attempt to ease the tax burden for Jews. In Brest-Litovsk, we can find numerous regulations forbidding Jews from leasing tax and estates, and concerning Christian servants in Jewish houses.The gentry demanded to levy an additional tax on Jews who were employing Christian servants.