Macedon and Monmouth

Does anyone know where the saying "As different as Macedon and Monmouth" originated from?

I've found it! It's from Shakespeare's Henry V.

Thanks for posting and letting us know.

Pardon me for being a dunce, but lacking a copy at hand of Henry V, I don't know whether there's any significance in this choice of place names. Is it just that both start with M, but are very far apart geographically? SS