Plan of Biržai Fortress, 1625Biržai, Town views description Plan of Biržai Fortress Biržai (Birsen (German), Birże (Polish), Birzhai (Биржай, Russian – pre-1917 Биржи), and בירז/Birz or Birzh (Yiddish). First mention in literature: 1455 Year 1625 Author – Sources www.museums.ltw viawww.wikiwand.com