Summary

The New International Encyclopædia…

Tyndareus afterwards engaged her suitors, who numbered about thirty, in a solemn oath to unite together to aid the husband whom Helen should choose, in case of any attempts being again made to carry her off. In accordance with this oath, her husband, Menelaus, when she was afterwards carried off by Paris, son of Priam, King of Troy, summoned all the princes of Greece to avenge the injury he had sustained, and thus gave rise to the Trojan War.
Source: Wikisource

Get perspective with Kwize: daily news enlightened by great literature