The R'lyeh Text is a set of occult writings created by Lin Carter for his Xothic Legend Cycle.
Overview
Containing information on, amongst others, the Great Old Ones Zoth-Ommog and Cyäegha, the R'lyeh Text was written by author or authors unknown.
A copy is known to have been held by the Sanbourne Institute of Pacific Antiquities. It was translated by a scholar named Jacob Maitland, who was so disturbed by what he learned from it that he destroyed both the original and the translation. It is unknown whether copies remain extant in other scholarly institutions.