(Great Underground Empire)
GUE (Great Underground Empire), also known as AE (After Entharion),
refers to the period of time from Entharion the Wise to the present.
The first year of Entharion was the year 0 GUE. While adding "GUE"
after the year did not become common practice until the latter part of
the eighth century, it was used almost immediately after
Pseudo-Duncanthrax began the Great Underground Empire project. The
earliest extant document using GUE was a letter from C. Agrippa dated in the
year 668 GUE.
GUE is also used frequently as an abbreviated form of "Great Underground Empire."