Back كاسيمير الاول دوق سيسزين ARZ Kazimír I. Těšínský Czech Kasimir I. (Teschen) German Καζιμίρ Α΄ του Τσέσυν Greek Casimir I, Duke of Cieszyn English Casimir Ier de Cieszyn French カジミェシュ1世 (チェシン公) Japanese Casimir I van Teschen Dutch Kazimierz I cieszyński Polish Казимир I Цешинский Russian
Casimiro I di Teschen (1280 o 1290 – 1358) fu duca di Teschen.
