a misbegotten son in the old testament who fought against the Ammonites after being exiled by his half-brothers. He vowed to sacrifice to his god the first person he met on his safe return from battle, which turned out to be his only daugher - whom he duly sacrificed.
This is basically the same story as Idomeneus sacrificing his son to Poseidon under similar circumstances... almost like it was plagiarized...
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Uses:
Ham. Am I not i' th' right, old Jephthah?
Pol. If you call me Jephthah, my lord, I have a daughter that I