Slavník dynasty
The Slavniks/Slavníks or Slavnikids (Czech: Slavníkovci; German: Slawnikiden; Polish: Sławnikowice) was a dynasty in the Duchy of Bohemia during the 10th century. The center of the semi-independent principality was the gord of Libice located at the confluence of the rivers Cidlina and Elbe. The Slavníks competed with the Přemyslid dynasty for control over Bohemia and eventually succumbed to them after the Massacre of the Slavníks (995), with their most notable member being Saint Adalbert of Prague. There's a scholarly debate about whether the dynasty can be identified with the White Croats.