Franz Kniprode

Franz Kniprode a Temerian mage or more precisely necromancer able to summon zombies who was residing for time near Old Castle. He appears only in 2004 video of where he asks witcher to help him get skull of Foltests grandfather, because there is something in it to help revive his dead wife.

However he does not appear in final game but looks similar to Everden of Rinde from Side Effects add-on.