Athenian Erechtheid princess; mother of Ion by Apollo. The Euripidean Ion (~412 BCE) is the major narrative source — a recognition-drama structured around the infant-exposure motif and the eventual reunion at Delphi. The cave-of-rape on the north slope of the Acropolis became a cult-site of Apollo Hypoakraios, attesting the topographic reality of the tradition in classical Athens. Distinct from Creusa wife of Aeneas (mortal Trojan princess, daughter of Priam).