High Quality Content by WIKIPEDIA articles! The Hyperborean cycle is a series of short stories by Clark Ashton Smith that take place in the fictional prehistoric setting of Hyperborea (present-day Greenland). Smith's cycle takes cues from his friends, Lovecraft and Robert E Howard and their works. Lovecraft wrote to Smith in a letter dated 3 December 1929: "I must not delay in expressing my well-nigh delirious delight at The Tale of Satampra Zeiros ... hat an atmosphere! I can see & feel & smell the jungle around immemorial Commoriom, which I am sure must lie buried today in glacial ice near Olathoe, in the Land of Lomar!" (Cf. Selected Letters III, pp. 87–8, Sauk City, WI: Arkham House, 1998. ISBN 0-87054-032-7.) Soon afterward, Lovecraft included Smith's Tsathoggua (which originally appeared in "The Tale of Satampra Zeiros") in the story "The Mound", ghostwritten for Zelia Reed (Zelia Bishop) in December 1929. Lovecraft also mentioned Tsathoggua in "The Whisperer in Darkness", which he began on February 24, 1930. (Schultz, "Notes Toward a History of the Cthulhu Mythos", pp. 16–17, note #6.) Because Smith in turn borrowed numerous Lovecraftian elements, the cycle itself may be regarded as a branch of the Cthulhu Mythos.