Greek Empire: Athens, Alexander and Byzantium
Which state was the Greek empire? Compare Athens, Alexander's empire, the Hellenistic kingdoms and Greek-speaking Byzantium with dates and clear distinctions.
Last updated October 2026
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There was no single state called the Greek empire across all of Greek history. The phrase has several uses. It can mean Athens, Alexander or the Hellenistic kingdoms. It can also mean the later Greek-speaking Eastern Roman Empire. World History Encyclopedia: Delian League World History Encyclopedia: Alexander the Great World History Encyclopedia: Hellenistic Period World History Encyclopedia: Byzantine Empire
Each had a different ruler, land and form of government. The Eastern Roman Empire belongs at the later end of this story, with a Roman identity as well as Greek language and culture.
TL;DR: Ask which period is meant. Athens dominated a league of cities. Alexander built a monarchy through conquest. His successors ruled several kingdoms. Much later, Byzantium was a Greek-speaking survival of the Roman state. These are linked histories, not one empire under changing names.
Greek empires at a glance
The entries follow World History Encyclopedia, World History Encyclopedia, World History Encyclopedia, World History Encyclopedia.
| State or period | Dates used here | Centre and form of power | Status |
|---|---|---|---|
| Athenian empire through the Delian League | 478–404 BCE | Athens led and increasingly controlled an Aegean alliance | Reviewed |
| Alexander's reign and imperial conquests | 336–323 BCE | A Macedonian king conquered the Persian Empire | Reviewed |
| Hellenistic kingdoms | From 323 BCE; the period is often ended at 31 BCE | Several monarchies ruled parts of Alexander's former empire | Reviewed |
| Greek-speaking Byzantine Empire | Medieval eastern Roman state, ending at Constantinople in 1453 | An emperor at Constantinople claimed Roman authority | Reviewed |
| One continuous Greek empire | No shared span | The phrase combines different states | Disputed |
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Athens: an alliance that became an empire
The Delian League began in 478 BCE after the wars against Persia. Athens and its allies sought to protect Greek cities and resist renewed Persian attacks. The league's treasury was first kept on the island of Delos. World History Encyclopedia
Member cities supplied money, ships or other resources. Athens led the fleet and gained increasing control over the alliance. When members tried to leave, Athens could use force to keep them within it. That change makes Athenian empire an apt description of its later power.
This empire was mainly a network of cities and islands tied to Athens by tribute and naval strength. It was not a monarchy with a king ruling the whole of Greece. Other Greek states, including Sparta, remained opponents rather than subjects.
Athens's defeat in the Peloponnesian War ended the league in 404 BCE. Its power should therefore be placed within the history of rival Greek city-states. The common language of those cities did not make them one united country.
The league also shows why an alliance and an empire are not always separate categories. A defence league can become unequal. One member may hold the ships and funds, then punish those who leave.
Alexander: a Macedonian king's conquests
Alexander became king of Macedon in 336 BCE after Philip II's death. He received a powerful army and his father's leading position among the Greek states. His later campaigns created a much wider empire. World History Encyclopedia
He crossed into Asia Minor in 334 BCE and fought the Persian Empire. His victories carried his rule through the eastern Mediterranean, Egypt, Mesopotamia and farther east. His campaigns reached the Indian subcontinent.
Greek speech and culture spread through this empire. Greek and Macedonian forces helped build it. Calling it Alexander's empire is more precise about the ruler who held it together. His subjects included many peoples with their own long-established traditions.
Alexander ruled as a king, rather than through the offices of an Athenian democracy. He also adapted elements of Persian royal practice. His subjects had many forms of government and culture. They did not all live like one Greek city.
His death in 323 BCE left no settled succession that kept the whole land united. His commanders fought for control. The political empire split, even as the movement of Greek language, people and ideas continued.
The Hellenistic kingdoms after Alexander
The Hellenistic period normally begins with Alexander's death in 323 BCE. It was marked by successor monarchies, their wars and the spread of Greek culture across a large region. Actium in 31 BCE is a common endpoint. Egypt's last major Hellenistic kingdom soon fell. World History Encyclopedia
The best-known successor houses included the Ptolemies in Egypt and the Seleucids in much of western Asia. Macedonia also had its own royal history after Alexander. These rulers competed with each other. They did not form a single Greek empire.
Greek was important in courts and cities. Local languages and forms of worship continued. A shared cultural language could connect people across borders without bringing them under one king.
The word Hellenistic is useful for that wider cultural setting. It covers literature, art, science, cities and monarchy as well as warfare. It should not be mistaken for the name of a single government.
Rome later took control of these regions. Greek culture survived that political change and remained influential under Roman rule. The later eastern empire grew within this Roman setting, rather than by restoring Alexander's united monarchy. World History Encyclopedia
Byzantium: Greek-speaking, with a Roman identity
The Byzantine Empire was the medieval survival of the Roman state in the East. Its centre was Constantinople. Greek became its main language. Its emperors and people continued to identify their state as Roman. World History Encyclopedia
That is why some accounts call it a Greek empire. The phrase captures a major feature of its language and culture. It becomes incomplete when it leaves out the office, law and Roman identity that the state received.
Its history also belongs to a different period from Athens and Alexander. Christian worship shaped its public life. Its emperors claimed succession from Roman rulers, rather than a return to the Delian League or Alexander's kingship.
The was the Eastern Roman Empire a Greek empire page explores this identity question. For the Turkish name and the surviving city, see Bizans empire.
How to tell which Greek empire a source means
Look first for a named ruler or city. Athens points to the naval empire and its allies. Alexander points to the Macedonian conquest of Persia.
Ptolemaic or Seleucid points to a successor kingdom. Constantinople points to the eastern Roman world.
Next, check the form of power. Tribute paid by allied cities is different from royal rule over provinces. An emperor claiming Roman power is different again. The label Greek alone does not tell you how the state worked.
Finally, separate cultural reach from political control. Greek books, language or art could travel outside the borders of a Greek-led state. Their presence does not prove that the place was part of one empire.
The Roman Empire timeline helps place the later Roman and Byzantine stages. The eastern empire map makes clear that Byzantium's land changed during its own long life.
Verdict: Greek empire
Greek empire is a broad phrase with several possible meanings. Use Athenian empire, Alexander's empire, a named Hellenistic kingdom or Eastern Roman Empire when precision matters. Greek culture connects these histories. But their governments and borders were different.
Sources checked for this page
- Delian League - World History Encyclopedia
- Alexander the Great - World History Encyclopedia
- Hellenistic Period - World History Encyclopedia
- Byzantine Empire - World History Encyclopedia
Questions people also ask
Was there one Greek empire?
No single state covers all the history described by that phrase. Athens, Alexander's empire, successor kingdoms and Byzantium were different political systems.
When did Athens have an empire?
The Delian League began in 478 BCE and ended with Athens's defeat in 404 BCE. Athens's growing control turned the alliance into an empire.
Who built Alexander's empire?
Alexander III of Macedon built it through conquests after becoming king in 336 BCE. He died in 323 BCE.
What happened after Alexander died?
His successors fought over his territory and created separate Hellenistic kingdoms. His empire did not remain united.
Was the Byzantine Empire a Greek empire?
It was largely Greek-speaking in its medieval form, but its rulers and people identified their state as Roman.
Does Hellenistic mean one empire?
No. It describes a broad period and cultural setting, including several rival kingdoms after Alexander.