Forgotten Realms
The "Campaign Set" (often referred to as the "Grey Box") was later released in 1987 as a boxed set of two source books ("Cyclopedia of the Realms" and "DM's Sourcebook of the Realms") and four large maps, designed by Greenwood in collaboration with author Jeff Grubb. The set introduced the campaign setting and explained how to use it, and reserved space on the map for SSI's Gold Box computer role-playing games set in the Forgotten Realms.
Ed Greenwood
In 1986, the American game publishing company TSR began looking for a new campaign setting for the "Advanced Dungeons & Dragons" game, and assigned Jeff Grubb to find out more about the setting used by Greenwood in his articles for "Dragon" magazine. According to Greenwood, Grubb asked him "Do you just make this stuff up as you go, or do you really have a huge campaign world?"; he answered "yes" to both questions. TSR felt that the Forgotten Realms would be a more open-ended setting than the epic Dragonlance setting, and chose the Realms as a ready-made campaign for "AD&D" 2nd Edition.