This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Cyclops (Greek)
In Greek mythology and later Roman mythology, the Cyclopes are giant one-eyed creatures. Three groups of Cyclopes can be distinguished. In Hesiod's Theogony, the Cyclopes are the three brothers Brontes, Steropes, and Arges, who made for Zeus his weapon the thunderbolt. In Homer's Odyssey, they are an uncivilized group of shepherds, the brethren of Polyphemus encountered by Odysseus. According to the accounts of Hesiod and the mythographer Apollodorus, the Cyclopes had been imprisoned by their father Uranus.
Zeus later freed the Cyclopes, and they repaid him by giving him the thunderbolt. Although the primordial Cyclopes of the Theogony were presumably immortal (as were their brothers the Titans), the sixth-century BC Hesiodic Catalogue of Women, has them being killed by Apollo.[14] Later sources tell us why: Apollo's son Asclepius had been killed by Zeus' thunderbolt, and Apollo killed the Cyclopes, the makers of the thunderbolt, in revenge.