レシェク1世
The last goal of Casimir's reign was at the beginning of 1194, when he organized an expedition against the Baltic Yotvingians. The expedition ended with a full success, and Casimir had a triumphant return to Kraków. After a banquet was held to celebrate his return, Casimir died unexpectedly, on 5 May 1194. Some historians believed that he was poisoned. He was succeeded as High Duke by his eldest surviving son Leszek I the White, who like his father had to face the strong opposition from Mieszko III the Old. Casimir was probably buried at Wawel Cathedral.