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Local powerByzantion
Primary culture
Propontic (Hellenistic)

Capital province
Byzantion (1453)

Plutocratic Republic

State religion
Military traditions
Flag of Byzantion Byzantine heritage

Ship cost.png −10% Ship Building Cost
Create trade route cost modifier.png -25% Create Trade Route Cost
Morale of armies.png -5% Morale of Armies

Flag of Byzantion Byzantion is a local power in the Thrace region, a Megaran colony founded on the western side of Bosphorus Strait to control the rich trading routes to the Euxine Sea near the border of the Greek and Persian worlds. As a small city state squeezed between the more powerful Diadochi kingdom of Flag of Thrace Thrace to the west and the smaller powers of northern Anatolia to the east, with the major power of the Flag of Antigonid Kingdom Antigonid Kingdom and its many feudatories nearby to the south, Byzantion is in a relatively difficult position and will have to play its diplomatic hand well or expand its power base quickly if it hopes not to be dominated by larger powers. Ruled by Archon Ioannes Ioannus Caesar in 450 AUC, Byzantion would historically survive the Wars of the Diadochi and subsequent Celtic invasions before peacefully submitting as a Flag of Rome Roman subject, taking advantage of the many trade routes passing through the area and its strategic position between Europe and Asia to become a rich, prosperous city worthy of being an imperial capital.


Main article: Greek missions#The Hospitable Sea

As a Thracian culture country, Byzantion has access to the unique Euxine Sea Hellenistic cultural mission tree The Hospitable Sea from game start, directing it to expand its influence and dominate the Euxine Sea region. Like most other Hellenistic group countries, if Byzantion conquers territory in Greece it can also get the Greek cultural mission tree Pan-Hellenic Government and attempt to unite the Greek city-states into a new Flag of Hellenic League Hellenic League.

Like all other countries, Byzantion also has access to the generic missions at all times.


As Byzantion has Hellenistic primary culture, it can take the decision to reunite Alexander the Great's empire and form the Flag of Argead Empire Argead Empire if it controls the required territories. This, however, will require Byzantion to change its government type to a monarchy.


Reunite Alexander's Empire

For too long parasites and scavengers have made a feast of the Great Empire that Alexander spent a lifetime building. It is time we do away with all claimants, usurpers and delusional provincial strongmen. There can be only one authority within the empire of Alexander the Great, one upholder of the great Hellenistic legacy that this great man founded.

That one power could not possibly come from any dynasty but our own. Only a family that respects the Argead traditions can legitimately claim its legacy.

Potential requirements
  • Has not previously formed the Flag of Argead Empire Argead Empire
  • Has at least 1 territory
  • Country is in the Hellenistic culture group
  • Is a monarchy
  • Is not Flag of Argead Empire Argead Empire
  • Is not AI-controlled or has more than 40 territories
  • Flag of Argead Empire Argead Empire does not current exist
  • Is a monarchy
  • Is not at war or in a civil war
  • Owns or has a subject that owns the following territories:
    • Pella (379)
    • Korinthos (418)
    • Thebai (426)
    • Sparta (427)
    • Argos (440)
    • Athenai (416)
    • Lysimacheia (350)
    • Gordion (189)
    • Sardeis (292)
    • Alexandreia (516)
    • Memphis (500)
    • Gaza (659)
    • Tyros (743)
    • Antigoneia (790)
    • Epiphaneia (1874)
    • Ammoneion (5537)
    • Babylon (918)
    • Seleukeia Megale (911)
    • Sousa (946)
    • Persepolis (4799)
    • Ekbatana (1595)
    • Alexandreia Kaukaso (6611)
    • Taxila (7314)
    • Alexandrou Limen (6821)

  • If the country is tribal, add the modifier Civilizing Tribe for 10 years, giving:
    • Civilization.png +0.10% Monthly Civilization Change
    • Local pop promotion speed.png +2 Pop Promotion Speed
    • Integrated culture happiness +10% Integrated Culture Happiness
  • If the government type is not Empire or Imperial Cult, set the country's government to Empire
  • Get the modifier Argead Unification until the end of the game, giving:
    • Unintegrated culture group happiness +6% Unintegrated Culture Group Happiness
    • Land morale.png +5% Morale of Armies
    • Diplomatic reputation.png +2 Diplomatic Reputation
    • Freeman happiness +8% National Freeman Happiness
  • Current country becomes Flag of Argead Empire Argead Empire
  • Get the event Capital of an Empire
  • Get claims on all unowned provinces in the regions of Parthia, Syria, Ariana, Bactriana, Media, Persis, Gedrosia, Mesopotamia, Assyria, Bithynia, Cappadocia, Galatia, Cilicia, Asia, Greece, Palestine, Gandhara, Lower Egypt, Upper Egypt, Macedonia, and Thrace
  • If the country is Flag of Antigonid Kingdom Antigonid Kingdom, Flag of Macedon Macedon, Flag of Seleukid Empire Seleukid Empire, Flag of Egypt Egypt, or Flag of Thrace Thrace and is not AI-controlled, award the achievement No More Worlds Left to Conquer
  • Get Province investment 5 free province investments


Byzantion starts off with a Population.png population of 26 in its Local.png 3 territories, all of whom are Hellenic Propontic. The population type breakdown is listed below:

  • 1 Pop noble.png Noble
  • 4 Citizens Citizens
  • 10 Freemen Freemen
  • 2 Tribesmen Tribesmen
  • 9 Slaves Slaves


Byzantion's starting cities produce Fish (Philia), Cloth (Selymbria) and Earthenware (Byzantion). The capital of Byzantion also has the special Bosphorus modifier, giving Tax income.png +10% Local Tax and Fort defense +10% Fort Defence.


Pan-Hellenic League icon
Pan-Hellenic League
As any Greek Republic, own the entire region of Greece.