was a warrior who helped the sorceress Visenna
and who was presumably Geralt of Rivia
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").
Geralt's father appears in the first episode of The Hexer
TV series, though his name is not mentioned.