The castle was probably established at the end of the 13th century by the marauding knight Friduš (or Helfrid) of Linava who used the castle as a base for robbing merchants during the unsettled times that followed the murder of Wenceslas III, the last Přemyslide, in 1306. As Friduš's escapades could not be ignored, young King John of Luxemburg sent his troops to deal with the bandits. Although Friduš perished, he gave his name to the castle.[1] At the turn of the 14th century the Kravař family acquired it, after which it became the center of their extensive estates. During the 14th and the beginning of the 15th century the castle was remodelled as a Gothic fortress. The Lords of Kravař owned the castle until 1447, and it was then held mostly by a number of Moravian noble families, among them the Sovinec family, the Kostek of Postupice family, the Pernštejn, the Ludanice and the Vrbno family.[2] This unassailable structure withstood a number of sieges. It was an important Hussite bastion against the German catholic town of Olomouc and also acted in support of King George of Poděbrady against the Hungarian King Mathias Corvin who was unable to defeat the king's troops and capture the fortress in 1468.[2] Not even the Swedes and the Danes succeeded in capturing it during the Thirty Years' War.