Ang Royal Road ay isang sinaunang highway na muling inayos at itinayo ng Persian king Darius the Great (Darius I) ng unang (Achaemenid) Persian Empire noong ika-5 siglo BC

Answer:

The Royal Road was an ancient highway reorganized and rebuilt by the Persian king Darius the Great (Darius I) of the first (Achaemenid) Persian Empire in the 5th century BC.[1] Darius built the road to facilitate rapid communication throughout his large empire from Susa to Sardis.[2] Mounted couriers of the Angarium were supposed to travel 1,677 miles (2,699 km) from Susa to Sardis in nine days; the journey took ninety days on foot.[3]

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