História verdadeira por Lucian de Samosata é oficialmente conhecido como a mais antiga representação de criaturas alienígenas na literatura, datada do século II dC
In True Stories, Lucian and a company of adventuring heroes sail westward through the Pillars of Hercules (the Strait of Gibraltar) in order to explore lands and inhabitants beyond the Ocean, are blown off course by a strong wind, and after 79 days come to an island. This island is home to a river of wine filled with fish and bears, a marker indicating that Heracles and Dionysus have traveled to this point, along with normal footprints and giant footprints.
Shortly after leaving the island, they are lifted up by a whirlwind and after seven days deposited on the Moon. There they find themselves embroiled in a full-scale war between the king of the Moon and the king of the Sun over colonisation of the Morning Star, involving armies including such exotica as stalk-and-mushroom men, acorn-dogs ("dog-faced men fighting on winged acorns"), and cloud-centaurs. Unusually, the Sun, Moon, stars and planets are portrayed as locales, each with its unique geographic details and inhabitants. The war is finally won by the Sun's armies clouding the Moon over. Details of the Moon follow; there are no women, and children grow inside the calves of men.
Eu diria que "centauros da nuvem" se qualificam como uma das criaturas alienígenas mais estranhas da história ... e foi a primeira!