Where do "moneda" and "money" come from?

The other day in class we were commenting on the origin of the cognate words moneda (Spanish for coin) and English money, and I suggested that they came from the Latin verb monēo "to warn". At first sight this might not make much sense: what can the relationship between money/moneda and warn be?? But I knew I had read it somewhere: you always remember things that strike you! And I have finally found it!

In his Lenguaje e historia, Salvador Núñez states that both money and moneda derive from the perfect participle of the verb monēo, namely, monēta, which was one of the epithets used for the Roman goddess Juno. This seems only logical, since she was the protector and special counselor of the state. But, again, where do moneda and money come into play? Well, curiously enough, it was in her temple in Rome were money was coined!