"When asked by the ruler of Egypt whether his geometry could not be made more simple, [Euclid] replied that there was no Royal Road"
(Europe, Norman Davies)
Quick browse in Wikipedia reveals that the Royal Road "was an ancient highway reorganized and rebuilt by the Persian king Darius I of the Achaemenid Empire in the 5th century BC. Darius built the road to facilitate rapid communication throughout his very large empire"
Hence I guess by extension a Royal Road is the shortest / surest / easiest way to get somewhere / reach one's goal?
Hence Royal Road to Card Magic?
I never knew that's where the expression came from, nor even suspected that the book's title was derived from it. You learn something new everyday don't you?

