Glorantha is a fantasy world created by Greg Stafford. It was first introduced in the board game White Bear and Red Moon (1975) by Chaosium, and thereafter in a number of other board, roleplaying and computer games. These include RuneQuest (1st ed. 1978), Hero Wars (1st ed. 2000) and HeroQuest (1st ed. 2003, 2nd ed. 2009), as well as several works of fiction and the computer strategy game King of Dragon Pass. The Gloranthan world is characterised by its complex use of mythology, heavily influenced by the universalist approaches of Joseph Campbell and Mircea Eliade, its Howardian ethos, its long and distinctive history as a setting for role-playing games, its community development and expansion, and (unusual among early American fantasy role-playing games) its relative lack of Tolkienesque influence.
Taken from http://en.wikipedia.org/wiki/Glorantha