Knights of the Green Stone
The Knights of the Green Stone are an esoteric mystery cult introduced in TMRE. They quest for the Green Stone, and are imitators of chivalric questing knights, inspired by the Grail Romances which they believe to hold esoteric magical meanings. Like all the groups in TMRE they are not strictly Canonical, and may or may not exist in your saga. The group holds three degrees of initiation, and is less than twenty years old.
See TMRE 131 for details.