The has already fallen in love with Helen,
The movie started when Prince Hector and his brother Paris have gone to Sparta to negotiate a peace treaty between Troy and Sparta. But that time, Paris has already fallen in love with Helen, the wife of king Menelaus. In the movie Paris really proved his love for Helen that he even bought her to Troy with him without thinking the consequence of his actions. As soon as Menelaus found out that Helen and Paris was having an affair, he planned to take a revenge. Menelaus approaches his brother Agamemnon, a king of Mycenae who has conquered every army of Greece, and now commands them. Agamemnon, who has wanted to conquer Troy for years, uses this as a justification to invade Troy.