Stafford first wrote about in Glorantha in 1966 as a way to deepen his own understanding of mythology. He founded the company Chaosium to publish the board wargame "White Bear and Red Moon" in 1975, which was set in Glorantha. Chaosium later published other games in the setting, including the critically acclaimed "RuneQuest". Various later editions of "RuneQuest", the narrative role-playing game "HeroQuest" (the first edition of which was published as "Hero Wars"), and the video game "King of Dragon Pass" were also set in Glorantha, as were several prominent fan efforts. Stafford has also explored the Gloranthan setting in the fantasy novel "King of Sartar" and a number of unfinished works published under the collective name of "the Stafford Library".