After Hecuba and Priam had their baby, they were told to kill him, so they told Agelaus to do the deed. He did not want to to kill this baby, so he decided to bring Paris to the forest, and he left him there overnight. The next day, Paris was completly alive, so Agelaus let him keep his life in secret, had he raised Paris as his own child.
Paris grew up to be a strong, attractive man, and he had a beautiful bull that he was very proud of, so he decided to challenge anyone to a bull fight, and the winner would receive a golden crown. Ares took the challenge, and ended up winning, so he took home the golden crown. The other gods heard that Paris was a man that kept his word, so many of them trusted him.
Zeus planned a wedding on Olympus, and all of the gods and goddesses were invited, except for Eris. When Eris found out, she stormed into the wedding and threw a very valuable golden apple that said kallisti. All of the ladies rushed to get it, but only three goddesses were left, Hera, Aphrodite, and Athena. Zeus couldn't settle who gets it, so he had Paris come and settle it.
The goddesses began to offer bribes to Paris. Hera offered to make him the King of Europe and Asia, if he selected her to have the golden apple.
The next goddess was Athena, and she offered to give hime wisdom, and to make hime the finest warrior alive.
The last goddess was Aphrodite, and she offered to give him love. Paris couldn't pass up being in love with the most beautiful goddess, Helen, so he agreed, and gave Aphrodite the golden apple. When King Menelaus noticed his queen was gone, all of his former suitors vowed to fight and get Helen back to Sparta, so then the land of Troy would be destroyed. All of this sparked the start of the Trojan War.