Korin
From Witcher Wiki
Korin on the cover of the Droga bez powrotu graphic novel
Korin - a warrior who helped sorceress Visenna defeat Fregenal's Koshchey and was presumably Geralt of Rivia's father.
Korin appears in the "Droga, z której się nie wraca" short story and the "Droga bez powrotu" graphic novel based on it (also in a flashback in the comic "Zdrada", as well as the first episode of The Hexer TV series.
