Pelion
The apple of discord and the Trojan War
When gods didn't invite Eris to the wedding of Peleus and Thetis, she left out of anger a gold apple, as known as the "apple of discord", to slide down in order guests gods see it and envy the latter. The apple that bore the inscription «τῇ καλλίστῃ«, ie (dedicated to ...) the most beautiful (... goddess).
It was natural that the three attendees goddesses, Hera, Aphrodite and Athena insist upon having the apple, each for herself. Zeus saw the fight and told to Hermes go fast in Paris to choose the one, which will take the apple.
And so that happened. To coax him, Athena promised him spiritual wisdom, and Hera physical strength. But Venus promised him the beautiful Helen, the most beautiful woman in the world. Paris was not knowing that Helen was the wife of Menelaus, gave the apple to Aphrodite. With the abduction of Helen by Paris, according to the legend, Trojan War began and Eris has achieved what she wanted.