The thesis discusses and compares two of the most popular fantasy works of all time: John R. R. Tolkien's The Lord of the Rings and George R. R. Martin's A Song of Ice and Fire. The theoretical part explor es the biographical elements and different historical background of the authors, which might have influenced the writings of the two works . It also examines elements that define the fantasy genre, among them recurring archetypes that typically occur in fantasy fiction. These theoretical aspects are then applied to the novel The Lord of the Rings and to A Song of Ice and Fire series. I examine the archetypes into which the main characters of both works fit, the secondary world and the theme of good and evil, discussing the similarities as well as the differences between the two works.