Mordenkainen (MOR-den-kay-nen)

Mordenkainen, also known as Lord Mage of Greyhawk, is a legendary mage of untold power in the Flanaess. A master of the arcane arts, he retired from decades of adventuring and founded the Circle of Eight. Although he's close to seventy, his appearance suggests a much younger middle-aged man. His piercing brown eyes provide a sense of his genius intellect tinged with madness. He keeps a neatly trimmed Van Dyke beard and shaves his head bald.
Current Location
Age
69
Children
Eyes
brown
Hair
bald
Height
5'11"
Aligned Organization

Real World History:
After DMing the first group in 1972, Gary Gygax asked a fellow player to take the reins so Gary could be a player. In 1973, he rolled up Mordenkainen which is a portmanteau of the Finnish mythical heros of Mordecai and Lemminkainen. This character was to become Gary's most famous and favorite character until 1985 when Gary was forced out of TSR.
Sources:

Greyhawk Wiki - Mordenkainen
Wiki - Mordenkainen