A cyclops is a primordial giant with a single eye in the centre of his forehead. They are strong, stubborn and emotional. They are also very good blacksmiths and the noises proceeding from the heart of volcanoes can be attributed to their operations. Cyclopes are present in Greek and Roman mythology . On escaping Troy after the Trojan War, Aeneas landed on the Island of the cyclops.
Other creatures similar to the Cyclops include:
The Arimaspoi, a legendary people who lived in the foothills of the mountains north of the Black Sea. They liked trying to steal gold from griffins so were constantly at war with them.
The Hitotsume-kozo of Japanese folklore are the size of ten-year old children, resemble Buddhist monks and have a “single, giant eye peering from the center of the face, along with a long tongue”
And apparently Odin, king of the Norse Gods, gave up one eye to gain wisdom and power.