THE DAIMONES PROSEOOUS were six sea Daimones (Spirits) which haunted the dark sea-caverns of the island of Rhodes. They once dwelt upon the earth but as punishment for driving Aphrodite away from the island they were driven mad and committed horrendous crimes including the rape of their own mother. Poseidon was disgusted with his sons and confined them in the island's sea-caverns.
The Eastern Daimones resemble the Telkhines of Keos.
Diodorus Siculus, Library of History 5. 55. 4 (trans. Oldfather) (Greek historian C1st B.C.) :
"Poseidon, the myth continues, when he had grown to manhood, became enamoured of Halia, the sister of the Telkhines (Telchines), and lying with her he begat six male children and one daughter, called Rhodos, after whom the island [of Rhodes] was named . . . And while these were still young men, Aphrodite, they say, as she was journeying [after her birth in the sea] from Kytherea (Cytherea) to Kypros (Cyprus) and dropped anchor near Rhodes, was prevented from stopping there by the sons of Poseidon, who were arrogant and insolent men; whereupon the goddess, in her wrath, brought a madness upon them, and they lay with their mother [Halia] against her will and committed many acts of violence upon the natives. But when Poseidon learned of what had happened he buried his sons beneath the earth, because of their shameful deed, and men called them the Eastern Demons (proseoous daimones); and Halia cast herself into the sea."
Diodorus Siculus, Library of History 5. 55. 5 :
"And at this period in the eastern part of the island [of Rhodes before the great Deluge] there sprung up the Gigantes (Giants) [the Daimones Proseoous], as they were called; and at the time when Zeus is said to have subdued the Titanes (Tians), he became enamoured of one of the Nymphai (Nymphs) [of the island], Himalia by name."
- Diodorus Siculus, The Library of History - Greek History C1st B.C.