Gruad Greyface

Gruad Greyface is the legendary founder of the Illuminati in The Illuminatus! Trilogy.

The Illuminatus! Trilogy
If legend can be trusted (according to TIT), he is an ancient mutant scientist from Atlantis, the original homo neophilus. His mutation also caused him to be mostly hairless (unlike his Atlantean brethren), except for the short hair on his head and his beard, which he also kept cropped short. He was the founder of the Party of Science, which probably was a precursor of the Illuminati. His personal symbol, which was later taken over by his party, was the eye in the triangle. He might be still living in modern times under the guise of the Dealy Lama.

Principia Discordia
The character is called simply "Greyface" in Principia Discordia which inspired TIT.