Siʹnon
.A Greek who induced the Trojans to receive the wooden horse. (Virgil: Æneid, ii. 102, etc.) Anyone deceiving to betray is called “a Sinon.”
“And now securely trusting to destroy,
As erst false Sinon snared the sons of Troy.”
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.