Wenseslaus I (kwa Kicheki Václav, ˈvaːtslaf; 907 hivi - 28 Septemba 935) alikuwa mtawala (kníže) wa Bohemia tangu mwaka 921 hadi alipouawa na mdogo wake, Boleslaus I. Anaheshimiwa kama mtakatifu mfiadini. Sikukuu yake huadhimishwa tarehe 28 Septemba. Nchini Ucheki ndiyo sikukuu ya taifa. Watakatifu wa Agano la Kale Orodha ya Watakatifu Wakristo Orodha ya Watakatifu wa Afrika Orodha ya Watakatifu Wafransisko Christiansen, Rupert. "The story behind the carol: Good King Wenceslas", The Telegraph, 14 December 2007 Mershman,Francis. "St. Wenceslaus." The Catholic Encyclopedia Vol. 15. New York: Robert Appleton Company, 1912. 8 January 2016 Describing the Codex Gigas, a thirteenth-century manuscript from Bohemia in the Swedish National Library in Stockholm, it is stated: "All this bears witness to the outstanding importance of the cult of Vaclav in Bohemia at the time of the Devil's Bible's compilation. Moreover, all three festivals are inscribed in red ink, denoting their superlative degree." Within a few decades of Wenceslas' death four biographies of him were in circulation.