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.
Forgotten Realms
Although the Realms were yet to be an official campaign world, the module "H1: Bloodstone Pass", released in 1985 by TSR, is now considered to be a part of the Forgotten Realms, although it wasn't until module H3 "The Bloodstone Wars" was released that Forgotten Realms became the official setting for the module series. The first official Forgotten Realms product was Douglas Niles's "Darkwalker on Moonshae", the first book in "The Moonshae Trilogy", which predates the "Forgotten Realms Campaign Set" by one month.