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The only goddess uninvited to their wedding was Eris. Eris threw a golden apple to the the table during the wedding banquet, that was meant "to the fairest". (https://en.m.wikipedia.org/wiki/Apple_of_Discord)
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The judgement of Paris was lead by what had happened in Pelius and Thetis' wedding; That during the feast, Eris produced the Apple of Discord, which then started the quarrel and then again, that led to the Judgement of Paris. ( https://en.m.wikipedia.org/wiki/Peleus)
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Menelaus was a king of Sparta, the husband of Helen of Troy, and a central figure in the Trojan War. And for Menelaus, Paris was a very important and royal guest.(https://en.m.wikipedia.org/wiki/Menelaus)
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When Menelaus left Sparta to go to a funeral, Paris got advantage of that. So, when Paris left Sparta, he took Helen with him back to Troy. And thats how he abducted her. (http://ancienthistory.about.com/cs/grecoromanmyth1/f/menelausdeath.htm)
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They had made an oath a long time ago that meant that they would back her husband to defend her honor. And they came from many kingdoms. (https://en.m.wikipedia.org/wiki/Helen_of_Troy) and (http://www.maicar.com/GML/SUITORSHELEN.html)
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He didn't want to go to war, but he promised Agamemnon 50 ships for the Greek fleet. (http://www.maicar.com/GML/Helen.html)
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This was the site for the Trojan War, in the region of Troad. (https://en.m.wikipedia.org/wiki/Troy)
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There were more than 9 years of war, but the the first 9 years were mainly about war in Troy and war with the regions near it. (https://en.m.wikipedia.org/wiki/Trojan_War)
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After a fruitless 10-year siege, the Greeks constructed a huge wooden horse, and hid a select force of men inside. The Greeks pretended to sail away, and the Trojans pulled the horse into their city as a victory trophy. That night the Greek force crept out of the horse and opened the gates for the rest of the Greek army, which had sailed back under cover of night. The Greeks entered and destroyed the city of Troy, decisively ending the war. (https://en.m.wikipedia.org/wiki/Trojan_Horse)
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The Trojan War happened because of Paris taking Helen of Troy with him back to Troy, which was Menelaus' wife. And he was the king of Sparta, and she was the Queen of Sparta.(http://www.history.com/topics/ancient-history/trojan-war)