Calauriʹa.
Pro Delo Calaurīa (Ovid: Metamorphoses, vii. 384). Calaurīa was an island in the Sinus Saronĭcus which Latõna gave to Neptune in exchange for Delos. A quid pro quo.
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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.