E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
gave to those who could wear it the virtue of chaste love and wifehood true; but if any woman not chaste and faithful put it on, it loosed or tore asunder. It was once the cestus of Venus, made by her husband Vulcan; but when she wantoned with Mars it fell off, and was left on the Acidalian mount. (Spenser: Faërie Queene, book iv. 11, 12.)