connection of Greyhawk characters to magical spells such as Tenser's floating disc, Bigby's crushing hand, and Mordenkainen's faithful hound. The AD&D Dungeon Masters Guide, released the following year, also made references to the dungeons of Castle Greyhawk. Players' curiosity was further piqued by the ten Dungeons & Dragons modules set in Greyhawk that were published between 1976–1979. Several of Gygax's regular columns in Dragon magazine also mentioned details of his home campaign and characters that inhabited his world. Gygax was surprised when he found out that players wanted to use Greyhawk as their campaign world. Development of geography Rather than using his own version of the Great Kingdom map, which included local areas based on real-world maps, Gygax decided to create an entirely new and greatly expanded version of Oerth. Needing many more original names for all of the geographical and political places on his map for the new and expanded areas, Gygax sometimes resorted to wordplay. He had previously used Perrenland on the Great Kingdom map, named after Jeff Perren, who co-wrote the rules for Chainmail with Gygax; but for the new Greyhawk map he added many more such names of friends and acquaintances. For instance, Urnst was a homophone of Ernst (his son Ernie); and Sunndi was a near-homophone of Cindy, another of Gygax's children. Gygax gave only the most basic descriptions of each state; he expected that DMs would customize the setting in order to make it an integral part of their own individual campaigns. His map included arctic wastes, desert, temperate forests, tropical jungles, mountainous cordillera, seas and oceans, rivers, archipelagos and volcanoes. Development of history and politics Gygax set out to create a fractious place where chaos and evil were in the ascendant and courageous champions would be needed. In order to explain how his world had arrived at this state, he wrote an outline of a thousand years of history. As a military history buff, he was very familiar with the concept of waves of cultural invasions, such the Picts of Great Britain being invaded by the Celts, who were in turn invaded by the Romans. In creating a similar pattern of history for his world, Gygax decided that a thousand years before his campaign began, the northeast corner of the continent had been occupied by a peaceful but primitive people called the Flannae, whose name was the root for the name of that