Paris would be born but Queen Hecuba had a dream she gave birth to a torch and so she went to the seer and he said that he will be the downfall of Troy and so they must kill Paris
For the Fairest Maiden
The general had to kill the baby and couldn't and he just left him there in the woods, the baby was found by a bear and was protected. the general came back and found the baby and decided to take care of the baby himself
Paris challenges anyone to a match with his bull and Ares comes down t win the match and Paris gives him the prize. The gods see he is a man of his word and so they appoint him as a judge.
Zeus throws a marriage party and doesn't invite Eris. Eris finds out and goes to a party and throws a golden apple, "For the Fairest". All the ladies for the golden apple.
It came down to Hera, Athena, and Aphrodite and they said Zeus decide which one was the fairest but he said no and told Paris to chose and they all bribed him but Aphrodite won after bribing him with the love of Helena.
Helen fell in love with Paris after he stole her from her Kingdom and so Helen's Husband started the Trojan war looking for Helen.