Empires and roads
Learn the toolkit that let one government rule millions of strangers across thousands of kilometres, using the Achaemenid Persian empire as the main example, and practise weighing sources against each other.
BEFORE
Power ran out at walking distance
The states of lesson 2 were mostly cities and small kingdoms. News moved at the speed of a walker, roughly 30 km a day. A king could conquer far-off lands, but once his army left, the locals stopped paying. Earlier empires such as the Assyrians held on largely through fear: destroyed cities and whole populations deported.
Fear works, but it is expensive. Every province needs a garrison, every garrison needs feeding, and hatred builds until the empire cracks. Assyria collapsed fast in the late 600s BCE.
WHAT CHANGED
An empire built to be administered
An empire is one government over many peoples, languages and religions. Around 550 BCE Cyrus founded the Achaemenid Persian empire, and under Darius, a generation later, it stretched from the Indus valley to the Aegean and Egypt: the largest state the world had seen. What made it last about two centuries was less the conquest than the system built afterwards.
Its best-known piece was the Royal Road: about 2,500 km from Susa, in today's Khuzestan, to Sardis near the Aegean coast, with guarded stations roughly a day's travel apart.
Check yourself
Shirin says the Royal Road was built mainly to help merchants. Which feature points to government as its first purpose?
- It passed through several rich trading cities on its way to Susa
- Staffed stations with fresh horses kept ready for the king's messengers
- Merchants and ordinary travellers were also seen using it
- It was very long, and only kings ever build long roads
Show the answer
Staffed stations with fresh horses kept ready for the king's messengers
Yes. Keeping horses and riders waiting at every station is costly, and it serves one customer: the court. Trade benefited, but as a side effect.
The imperial toolkit
- Roads and relay couriers
A message is handed from rider to fresh rider, day and night. Persians used mounted relays; the Greek writer Herodotus was impressed that neither snow nor heat stopped them.
- Provinces and inspectors
The land is divided into provinces under governors called satraps, often with a separate military commander, and royal inspectors who report straight to the king.
- Standard money and fixed dues
Coins had been invented in Lydia, in western Anatolia, around 600 BCE. Darius issued a standard gold coin, the daric, and set each province a known yearly tribute instead of irregular plunder.
- One office language
Aramaic was used for official letters from Egypt to Central Asia, whatever people spoke at home.
- Leave local life alone
Subject peoples kept their gods, laws and leaders, as long as they paid and stayed loyal.
Susa to Sardis ≈ 2,500 km
On foot (Herodotus) ≈ 90 days
2,500 km / 90 days ≈ 28 km per day
Royal relay ≈ 7 to 9 days
2,500 km / 9 days ≈ 280 km per dayThe relay is about 10 times faster than a traveller on foot.A king who hears of a revolt in nine days instead of three months can answer before it spreads. Speed of information is a form of power. Nothing on land beat this kind of relay by much until the railway and telegraph.
Check yourself
Match each problem of a huge empire to the tool that answers it
Show the answer
- News of a revolt takes months to arrive → Relay couriers on a maintained road
- A governor grows too powerful → Separate army commander and royal inspectors
- Every region weighs and pays differently → A standard coin and fixed tribute
- Officials cannot read each other's letters → One shared office language
Two ways to hold conquered people
Rule by fear
Destroy, deport, garrison. It breaks resistance quickly, but it is costly and leaves subjects waiting for their chance to revolt.
Rule by bargain
Keep your temple, your customs and your local leaders; pay your tribute and send your soldiers. It is cheaper and steadier. It is still an empire: tribute was heavy, and revolts in Egypt, Babylon and Ionia were put down by force.
Check yourself
Letting conquered peoples keep their own gods and laws made the Achaemenid empire cheaper to hold, not weaker.
Show the answer
True
True. Tolerance here was good statecraft before it was anything else: people who keep their gods and customs have less reason to revolt, so the empire needs fewer garrisons and fewer punitive campaigns. It was a real improvement on the mass deportations that came before it, and you can admire it without pretending it was a twenty-first-century belief in human rights. Judging the past by its own options is a core historical skill.
The same toolkit, elsewhere
| Empire | Moving messages | Making things the same |
|---|---|---|
| Maurya India, 200s BCE | Royal roads with rest houses | Ashoka's edicts carved on pillars |
| Qin and Han China, from 221 BCE | Post roads and relay stations | One script, weights and axle width |
| Rome, to about 400 CE | Paved roads, state courier service | One law and coinage |
| Inca, 1400s CE | Mountain roads with relay runners | Knotted-cord records, no writing |
Check yourself
- Persia, 500 BCE: mounted riders pass royal messages from station to station along a guarded road.
- The Inca in the Andes, 1450 CE, with no contact with Eurasia, no horses and no writing: runners pass messages from hut to hut along a guarded road.
What does this pair suggest?
- The Inca must have learned the idea from Persia
- Ruling across great distance pushes unrelated empires towards similar solutions
- Relay systems only work in mountain country
Show the answer
Ruling across great distance pushes unrelated empires towards similar solutions
Right. As with farming in lesson 1, the same problem produces similar answers in places that never met. That is a pattern, not a coincidence and not borrowing.
What followed, and how we know
- Peace and safe roads over a huge area let goods, crops and ideas travel. Lesson 4 picks this up.
- An unintended consequence: a road built for the king's riders carries an invader just as well. Alexander's army used the Persian road network to take the empire within about a decade, around 330 BCE.
- We have three kinds of source: Herodotus, a Greek outsider writing for Greeks; royal inscriptions such as Bisotun, where Darius tells his own story; and thousands of Persepolis tablets, dull office records of rations and travel passes.
- The dull ones are often the most trustworthy, because nobody wrote them to impress anyone.
Check yourself
Negar wants to know how workers who built Persepolis were actually paid. Which source should she trust most for that question?
- The administrative tablets listing grain and wine handed to named work groups
- Darius's royal inscriptions, because the king knew his own empire best
- Herodotus, because he is the most famous ancient historian
- All three equally, since they are all ancient
Show the answer
The administrative tablets listing grain and wine handed to named work groups
Yes. Ration records were made for internal bookkeeping, close to the events, with no audience to persuade. For this question they beat a foreign storyteller and a king's self-portrait.
Lesson recap
- The core problem of any empire is distance and difference: many peoples, far apart.
- The Achaemenid answer was a system: roads and relay couriers, provinces with inspectors, standard coin and tribute, a shared office language, and local customs left alone.
- Tolerance was practical statecraft, a real advance on rule by fear, and should not be dressed up as a modern idea.
- India, China, Rome and the Inca reached similar tools, because the same problem invites similar answers.
- Weigh sources by who wrote them and why; plain office records often beat grand stories.