Casimir I died in 1358 (although there are some indications that he lived until 1360, but this is refuted by the majority of historians) and was buried in the Dominican church of Cieszyn.
カジミェシュ1世は1358年（1360年まで生きていたという主張もあるが、歴史家の多くはこれを否定）に亡くなり、チェシンのドミニコ会教会に葬られた。