Royal Road

Proper noun

 * 1)  The longest road in the ancient system of trade routes and roads developed in Achaemenid Persia, which connected the capitals Sardis (in Asia Minor) to Susa (in Mesopotamia) and featured post-stations with service facilities.

Translations

 * Ancient Greek: ἡ ὁδὸς ἡ βασιληΐη
 * Persian: راه شاهی