Real cause of the Trojan War...

I had always thought that the blame for the Trojan War could be put squarely on the shoulders of Eris, the Goddess of Discord. At the marriage of the Nymph Thetis to the Peleus, King of Aegina, (the parents to Achilles) all the Gods and Goddesses were invited except for one: Eris. In her anger at this insult, Eris appeared at the wedding feast and threw an apple into the room before vanishing in a cloud of smoke. On the apple was inscribed: 'For the Fairest'. Of course all the Goddesses wanted to be crowned the Fairest but in the end the competition was narrowed down to three: Hera, Queen of Olympus; Athena, Goddess of Wisdom, Trade and the City; and Aphrodite, Goddess of Love and Laughter. The trio stood before Zeus, King of the Olympians, and asked him to adjudge who the most beautiful Goddess was. Zeus was now stuck between two rocks and a very hard place...any decision he made would be sure to cause bitterness and rivalry in his family. So, wisely, he refused to be the judge answering instead that there was one man, a mortal, who would be able to correctly choose the Fairest. This man, he said was Paris (or Alexandrius), son of Priam who was the King of Troy. The night Paris was born a soothsayer told the king that the boy would one day cause the destruction of Troy so the king told one of his attendants to make sure the boy never saw the light of day.The attendant, being a kindhearted man, could not bear to kill the child so instead he left the boy on the summit of Mount Ida where he would, no doubt, freeze to death. However that very night a kindly goatherd found Paris and brought him up as his own son. So at the time of the wedding of Thetis to Peleus, Paris was a grown man, a goatherd on Mount Ida. The three vying divinities went to him and asked him to cull out the fairest among them. Each promised a wondrous gift if she was selected: Hera promised that he would be a king of an empire and would have enormous wealth; Athena promised him great prowess in battle; and Aphrodite promised him the most beautiful woman in the world as his bride. Paris chose Aphrodite, thus incurring the undying wrath of Hera and Athena and the faithful affection of Aphrodite. The most beautiful woman in the world was Helen, daughter of Zeus, and years later Helen eloping with Paris would cause the Trojan War.

However recently I read a book which stated that the blame for the Trojan war should go to Prometheus, not Eris. Thetis and Zeus were at one point lovers. Prometheus foresaw that the son of Thetis would be far greater than his Father. Zeus immediately abandoned Thetis and arranges her marriage with Peleus. If the marriage had not occurred, the book argues, then Eris would not have been angered and the long train of events that caused the Trojan War would not have been triggered!

What do you think?