Conan the Adventurer

Robert E. Howard's Conan had been out of print since his pulp days but for some small press hardcovers in the fifties. In '66, Lancer brought the character to a mass audience once again, adorned with a Frank Frazetta cover. The books set Frank on his way to being the acclaimed fantasy artist he became and inspired Roy Thomas to push Marvel to license the character (which the would do 4 years later).