In the World of Greyhawk campaign setting

Campaign setting

A campaign setting is usually a fictional world which serves as a setting for a role-playing game or wargame campaign. A campaign is a series of individual adventures, and a campaign setting is the world in which such adventures and campaigns take place...

 for the Dungeons & Dragons

Dungeons & Dragons

Dungeons & Dragons is a fantasy role-playing game originally designed by Gary Gygax and Dave Arneson, and first published in 1974 by Tactical Studies Rules, Inc. . The game has been published by Wizards of the Coast since 1997...

roleplaying game, the Great Migrations is a general term applying to the migration of great hordes of Oeridians

Oeridians

In the World of Greyhawk campaign setting for the Dungeons & Dragons roleplaying game, the Oeridians are a race of humans living in the Flanaess...

 and Suel

Suloise

In the World of Greyhawk campaign setting for the Dungeons & Dragons roleplaying game, the Suloise, also known as the "Suel," are one of the major races of humans inhabiting the Flanaess....

 humans into the Flanaess

Flanaess

The Flanaess is the eastern part of the continent of Oerik, one of the four continents of the fictional world of Oerth in the World of Greyhawk campaign setting for the Dungeons & Dragons fantasy roleplaying game. The Flanaess has been the setting of dozens of adventures published between the 1970s...

 from western Oerik

Oerik

In the Dungeons and Dragons World of Greyhawk Campaign setting, Oerik is the largest continent on the world of Oerth, where the Greyhawk campaign takes place.Oerik is named after the Oeridians, a human people who settled much of the continent...

. The impetus for the migrations was political tension related to the conflict that erupted into the great Baklunish-Suloise Wars that ended in the Twin Cataclysms. The passage of these thousands of refugees displaced and destroyed much of the local Flan

Flan (Greyhawk)

In the World of Greyhawk campaign setting for the Dungeons & Dragons roleplaying game, the Flan are a race of humans living in the Flanaess. The Flan peoples were the first humans known to have settled the eastern portion of the continent of Oerik, the Flanaess, which is named for them...

 culture and shaped the modern Flanaess.

History

In -457 CY, the Oeridian tribes migrated east of the region now called Ull, pushed north and eastward by vast savage humanoid hordes employed as mercenaries by the Suel and Baklunish

Baklunish

In the World of Greyhawk campaign setting for the Dungeons & Dragons fantasy roleplaying game, the Baklunish are a race of humans inhabiting the Flanaess, as well as regions of Oerik further west....

. Suel peoples fleeing the increasingly erratic empire moved northward through the Kendeen (Harsh) Pass of the southern Crystalmists (now the Hellfurnaces) and spread out in all directions, coming into open conflict with the native Flan of the eastern lands and with the migrating Oeridians. In most cases the warlike Oeridians defeated Suel and Flan alike, pushing them to the peripheries and darkened wild places of the Flanaess.

A large number of savage humanoids followed in the wake of the migrating hordes, infecting the Flanaess with a brutal violence it had previously been spared.

Open hostilities between migrating factions persisted for two centuries, with notable pockets of Suel/Oeridian cooperation in places like the Sheldomar Valley. Four of the mightiest Suel clans pushed into the Thillonrian Peninsula, where they remained isolated for hundreds of years. Most Suel were pushed to the extreme southern reaches such as the Tilvanot Peninsula, the Amedio Jungle, the Duxchan Islands, and Hepmonaland

Hepmonaland

In the World of Greyhawk campaign setting for the Dungeons & Dragons roleplaying game, the continent of Hepmonaland is Southeast of the Flanaess. Hepmonaland was created as a in-game region where the Aztec culture is dominant and dinosaurs are very common monsters.Hepmonaland is the Suel and...

. Oeridians usually mastered conflicts with the Suel due to their friendship with the native elves

Elf (Dungeons & Dragons)

In the Dungeons & Dragons fantasy role-playing game, elves are a fictional humanoid race that is one of the primary races available for play as player characters. Elves are renowned for their grace and mastery of magic and weapons such as the sword and bow...

, gnomes

Gnome (Dungeons & Dragons)

In the Dungeons & Dragons fantasy role-playing game, gnomes are one of the core races available for play as player characters. Some speculate that they are closely related to dwarves; however, gnomes are more tolerant of other races and of magic, and are skilled with illusions...

, dwarves

Dwarf (Dungeons & Dragons)

In the Dungeons & Dragons fantasy roleplaying game, dwarves are a humanoid race, one of the primary races available for play as player characters...

, and halflings

Halfling (Dungeons & Dragons)

The halfling is a fictional race found in the Dungeons & Dragons fantasy role-playing game. Halflings are similar to humans except about half the size...

 of the Flanaess, to say nothing of the Flan themselves.

The strongest Oeridian tribe, the Aerdi, settled the land east of the Lake of Unknown Depths

Nyr Dyv

The Nyr Dyv, also known as the "Lake of Unknown Depths," is a fictional fresh water lake in the World of Greyhawk campaign setting for the Dungeons & Dragons roleplaying game...

 and founded the kingdom of Aerdy, which eventually became the Great Kingdom

Great Kingdom

In the World of Greyhawk campaign setting for the Dungeons & Dragons role-playing game, the Great Kingdom, or the Great Kingdom of Aerdy, refers to an empire that varied in size at various points in its history.-History:...

. The formation of Aerdy is generally considered the end of the Great Migrations period.

Migrations era tribes, houses, and political entities

The following political entities were extant in the era of the Great Migrations.

Kingdoms

• Barony of Lum the Mad (Oeridian)
• Kingdom of Tuerney the Merciless (Oeridian)