What is "tsathoggua"

Tsathoggua (the Sleeper of N'kai, also known as Zhothaqquah) is a supernatural entity in the Cthulhu Mythos shared fictional universe. He is the creation of Clark Ashton Smith and is part of his Hyperborean cycle.

Tsathoggua/Zhothaqquah is described as an Old One, a godlike being from the pantheon. He was invented in Smith's short story " The Tale of Satampra Zeiros", written in 1929 and published in the November 1931 issue of Weird Tales. His first appearance in print, however, was in H. P. Lovecraft's story " The Whisperer in Darkness", written in 1930 and published in the August 1931 Weird Tales.