Viduka proclaimed his lands as an independent kingdom and gave it the name which elves had used to call it for ages: Caedwen (which means "White Forest" in the Elder Speech). In order to protect his realm, the monarch formed an alliance with Aedireen, queen in Vengerberg, granting her in exchange the land of Lormark in the perpetual usufruct. The Kaedweni-Aedirnian alliance resulted in the astonishing victory over Redanian army, giving the region of Hagge to Aedirn and territories of Caingorn, Malleore, Barefield and Ban Gleán to Kaedwen. The new border of Kaedwen and Redania proved to be exceptionally durable and became the basis for an equally unchanging peace between both realms. In Hagge, Viduka with great reluctance agreed to keep the promise to his southern ally and hand him the control over the Pontar valley. That cession became the beginning of the long-standing conflict between the two eastern kingdoms.
- His is presumably reference to Vidugavia, a ruler from J.R.R. Tolkien's Middle-Earth, who was a self-styled first king of Rhovanion - a wild, forested realm resembling Kaedwen in lot of things.
- He appears only in Gra Wyobraźni, whose narrative is inconsistent in large part with informations contained in dynastic descriptions written by Andrzej Sapkowski.