ボレスワフ4世
The most important issues during the reign of Casimir, beside the conflicts with his brother Mieszko, were the diplomatic policies towards the neighbouring Russian principalities in the east. The first task before him as High Duke was to create bonds with the Rurik Grand Princes at Kiev, who were strongly associated with the previous High Dukes through their marriages to Kievan princesses (Bolesław IV the Curly with Viacheslava of Novgorod and Mieszko III the Old with Eudoxia of Kiev). For this purpose, in November 1178 Casimir arranged the marriage of his daughter with Prince Vsevolod IV of Kiev.