Outside of the wedding was the god of discord, who wasn't invited to the wedding.
There was a wedding between King Peleus and Thetis, every god or goddesses were invited to attend the wedding, except for the god of discord, Eris
Eris felt furious so she sneaks into the wedding and was planning to take revenge of all the gods and goddesses
I must now sail across the sea to find my wife
When Eris came to the wedding, she threw a golden apple out which say' kallistii' meaning to the fairest. All of a sudden all the gods and goddesses started to fight over the golden apple
Helen, you should come with me on this boat, and back to'my home'
They fought until there were three goddesses left, Athene, Aphrodite and Hera, they asked Zeus who should own the apple, but Zeus refused to answer. So the three of them went down to earth and asked a boy who was herding his animals named paris
The three of them would give Paris rewards if he would name them the fairest, Athene was willing to give him supereme wisdom, Hera then promised him in great wealth and power, lastly was Aphrodite promised him to the prettiest girl, with out think Paris chose Aphrodite's offer
So Paris, sails across the sea to find his girl, but little did he know his promised wife was already married to Menelaus.