From the Wikipedia entry... Khokarsa is a fictional empire in ancient Africa that serves as the primary setting for Philip Jose Farmer’s prehistoric fantasy novels Hadon of Ancient Opar and Flight to Opar (the Khorkasa series). Farmer has stated that he was inhabited by An Inhabitant Of Carcosa and operated on the idea that the syllables in the name Khorkasa were transposed to become known as Carcosa.