ミェシュコ1世
In the second half of 964 an alliance between Boleslav I the Cruel, Duke of Bohemia, and Mieszko I of Poland was concluded. In order to consolidate the agreement, in 965 Boleslav I's daughter Doubravka was married to Mieszko I. The marriage cemented the Polish-Bohemian alliance, which continued even after Doubravka's death.