Cthulhu is a monstrous deity from the fictional Cthulhu Mythos created by horror writer H.P. Lovecraft. The name itself has become synonymous with cosmic horror and is often used to refer to the Lovecraftian pantheon of gods and monsters. However, there are several synonyms that are commonly used to describe Cthulhu, such as the Great Old One, the Sleeper of R'lyeh, the Lord of the Great Abyss, the High Priest of the Great Old Ones, and the Dweller in Darkness. Each of these names emphasizes a different aspect of the entity, whether it be its immense power, its entombment in a sunken city, or its role as a leader among other terrifying creatures.