Explanation.

Ovid and Apollodorus agree that Æsacus was the son of Priam, and that he was changed into a didapper, or diver, but they differ in the other circumstances of his life. Instead of being the son of Alexirhoë, Apollodorus says that he was the son of Priam and Arisbe the daughter of Merope, his first wife; that his father made him marry Sterope, who dying very young, he was so afflicted at her death, that he threw himself into the sea. He also says that Priam having repudiated Arisbe to marry Hecuba, the daughter of Cisseus, Æsacus seeing his mother-in-law pregnant of her second son, foretold his father that her progeny would be the cause of a bloody war, which would end in the destruction of the kingdom of Troy; and that upon this prediction, the infant, when born, was exposed on Mount Ida.

Tzetzes adds, that Æsacus told his father that it was absolutely necessary to put to death both the mother and the infant which was born on that same day; on which Priam being informed that Cilla, the wife of Thymætes, being delivered on that day of a son, he ordered them both to be killed; thinking thereby to escape the realization of the prediction. Servius, on the authority of Euphorion, relates the story in much the same manner; but a poet quoted by Cicero in his first book on Divination, says that it was the oracle of Zelia, a little town at the foot of Mount Ida, which gave that answer as an interpretation of the dream of Hecuba. Pausanias says it was the sibyl Herophila who interpreted the dream, while other ancient writers state that it was Cassandra. Apollodorus says that Æsacus learned from his grandfather Merops the art of foretelling things to come.