Dæmon is the Latin word for the Ancient Greek daimōn (δαίμων: “god”, “godlike”, “power”, “fate”), which refers to the daemons of ancient Greek religion and mythology and of later Hellenistic religion and philosophy.
Daimons were the souls of men of the golden age acting as tutelary deities according to entry δαίμων at Liddell & Scott.
"Daemon" is the Latin version of the Greek daimōn.
Daemons are benevolent or benign nature spirits, beings of the same nature as both mortals and deities, similar to ghosts, chthonic heroes, spirit guides, forces of nature, or the deities themselves (see Plato's Symposium). According to Hesiod's myth, great and powerful figures were to be honoured after death as a daimon…"Daimon is not so much a type of quasi-divine being, according to Burkert, but rather a non-personified "peculiar mode" of their activity.
In Hesiod's Theogony, Phaëton becomes an incorporeal daimon or a divine spirit, but, for example, the ills released by Pandora are deadly deities, keres, not daimones. From Hesiod also, the people of the Golden Age were transformed into daimones by the will of Zeus, to serve mortals benevolently as their guardian spirits; "good beings who dispense riches…[nevertheless], they remain invisible, known only by their acts". The daimon of venerated heroes, were localized by the construction of shrines, so as not to wander restlessly, and were believed to confer protection and good fortune on those offering their respects.