In Greek and Roman mythology, Creusa was a Trojan princess, daughter of Priam and Hecuba, and — in Virgil, Livy, and Dionysius of Halicarnassus — the first wife of Aeneas and mother of Ascanius. Homer never names Aeneas's wife; some Greek sources call her Eurydice. In the Aeneid she is lost during the flight from Troy and appears to Aeneas as a shade who foretells his journey to Italy and a second marriage.
Adapted from Wikipedia, "Creusa (wife of Aeneas)" · CC BY-SA 4.0
I.Genealogy and Greek tradition
Apollodorus lists Creusa among the daughters Hecuba bore Priam after Paris's recognition; Hyginus includes her in his catalogue of Priam's children. Homer is silent on Aeneas's wife. Pausanias reports that Lesches and the Cypria named her Eurydice, while a story attached to Polygnotus' painting at Delphi said the Mother of the Gods and Aphrodite rescued Creusa from Greek slavery because she was Aeneas's wife.
Only in the first century BC — Virgil, Livy, Dionysius — is she securely named Creusa as Aeneas's spouse and Ascanius's mother. Dionysius makes Priam her father; scholia add a second son, Eurybates or Euryleon. Lycophron has Aeneas choose father and household gods when allowed to take one burden from his house, leaving wife and children behind — a scholion identifying the wife as Creusa.
II.Virgil's Aeneid
During the sack, Aeneas returns home for Anchises, Creusa, and Ascanius. Anchises refuses to leave until a flame crowns Ascanius and a shooting star confirms Jupiter's will. Aeneas carries his father, leads Ascanius by the hand, and has Creusa follow; in the rush through the gates she falls behind and is lost.
Aeneas leaves the others at Ceres' temple and searches the burning city. Creusa's shade meets him, declares that the gods detain her in Troy, prophesies his voyage to Hesperia and marriage to another woman, and asks him to care for their child. Three times he tries to embrace her; three times the shade slips through his arms — a scene that closes her role in the epic.
III.Homonyms
Creusa daughter of Erechtheus belongs to Athens and to Euripides' Ion. The Corinthian princess burned by Medea's poisoned gifts is Glauce, often also called Creusa. The Amazon and other minor Creusas of myth are unrelated. The Trojan Creusa is defined by the house of Priam and the Roman foundation legend through Aeneas and Ascanius.