An air spirit in Dryden’s King Arthur.
Philidel became a fugitive from hell when she refused to obey the evil commands of Osmond, a Saxon sorcerer. Merlin brought her into his service, and she saved Arthur from the malevolent schemes of Osmond and Grimbald, an enemy earth spirit.
Source
King Arthur; or, the British Worthy | John Dryden, 1691