Their dialect of a Germanic  language can be distinguished by the utterance of the word "vos" instead of "vas.
One member of this Jewish community, whose students included Chaim Volozhin or Ickowitz, stuck his feet in water to  stay up and study over sixteen hours a day. David Roskies posited that a defining characteristic of this community was the  consumption of salt-and-pepper kugel, which he links with the geographic "gefilte fish" line. Their dialect of a Germanic  language can be distinguished by the utterance of the word "vos" instead of "vas." They tended to place importance in  heads of Yeshiva, as opposed to "tsaddikim." Their major community centers included (*) Brest and Brisk. This group,  which usually aligned with the "mitnagdim" against the "Chassidim," had a prominent member named Vilna Gaon. For 10 points,  name this Jewish community that was granted a charter by Vytautas the Great and occupied a historical area centered on Vilnius.
One member of this Jewish community, whose students included Chaim Volozhin or Ickowitz, stuck his feet in water to  stay up and study over sixteen hours a day.
Litvaks [or Lithuanian Jews; accept Vilnius Jews before “Brest”]