Great Royal Road
Quick Summary
The Persian Royal Road was an ancient highway spanning over 2,400 km (1,500 miles) from Susa in Persia to Sardis and Smyrna on the Aegean Sea. King Darius I constructed it to improve communication across his empire, with some sections possibly predating his reign and built by Assyrian kings. Royal messengers could travel the entire length in about nine days using a relay system, a significant improvement over the usual three-month journey for normal travel. This road was also utilized by Alexander the Great during his conquest of the Persian empire. The route was a successor to an earlier track used by the Assyrians and was later duplicated by Cyrus II and Darius I.12
Ask Britannica AI about this topic
Britannica doesn't have a full article on this topic, so we've curated a list of our relevant coverage.
