Hankenstein Codex. An 11th–12th century Church Slavonic manuscript written in western Ukraine and preserved at the Austrian National Library in Vienna. Also called the Octoechos of Vienna, it is a 289-folio liturgical anthologium. Its language, which has many local features, has been studied by Stepan Smal-Stotsky (1886), Kost Kysilevsky (1953), and George Yurii Shevelov (1979).

[This article originally appeared in the Encyclopedia of Ukraine, vol. 2 (1988).]