Paris was born but was believed to be trouble, his father had his servant put the baby to death. Agelaus couldn't do it, so he left Paris on the mountain.
When Agelaus came back, Paris was alive and the servant knew he was meant to live. Agelaus raised him and Paris became a handsome, wise man.
One day, Paris challenged anyone's bull to fight his bull, and whoever won would win a golden crown. Ares transformed into a bull and won, Paris proved his fairness when he awarded Ares the crown.
She brought the apple!
Zeus planned a wedding feast for Thetis, but did not invite Eris because she brought chaos. She entered with a "fairness" golden apple and the goddesses fought over it. The final 3 were Hera, Athena, and Aphrodite. Zeus couldn't pick the winner, so he sent them to Paris, the fairest of all.
The 3 goddesses bribed Paris with wisdom, and leadership, but Aphrodite's offer stood out to him. She offered him Helen's love, the most beautiful girl. Paris chose Aphrodite's offer.
He went to King Menelaus's house, the husband of Helen, to capture her. Helen and Paris fell in love with each other instantly. When the King noticed his wife was gone, he sent his servants out and ordered to find her, and that Troy would be destroyed! Thus, the Trojan War began.