Prince Valiant RPG - Rules of Play says:
Outstanding for both beginners and experienced players, Prince Valiant® The Storytelling Game is a roleplaying game set in the Arthurian world of Hal Foster’s masterpiece comic strip. The game is by world-renowned game designer Greg Stafford (RuneQuest, King Arthur Pendragon). Like the majority of Greg’s games, the original edition of this game released in 1989 was published by Chaosium, Inc.