E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Limbus of the Moon.
In the limbo of the moon. Ariosto (in his Orlando Furioso, xxxiv. 70) says, in the moon are treasured up such stores as these: Time misspent in play, all vain efforts, all vows never paid, all intentions which lead to nothing, the vanity of titles, flattery, the promises of princes, deathbed alms, and other like vanities.