The princes of Greece were bound to help Menelaus retrieve Helen from Troy due to an oath that they all took prior to her marriage. When Helen, the daughter of Zeus, was to be married, her numerous suitors—including many powerful princes and kings of Greece—were forced to swear an oath to defend the chosen husband against any wrongdoers. Menelaus, who was eventually chosen to be Helen's husband, became the beneficiary of this oath.
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