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Local powerIstros
Primary culture
Bosporan (Hellenistic)

Capital province
Istros (4513)

Plutocratic Republic

State religion
Military traditions
Bosporan heritage

Notes: For Culture.png Bosporan culture countries.

Global capital trade routes.png +1 Capital Import Routes
Local pop promotion speed.png +10% Pop Promotion Speed
Pop assimilation.png -10% Pop Assimilation Speed

Flag of Istros Istros is a local power on the eastern coast of Thrace, a former Flag of Miletos Milesian colony that has come under the suzerainty of the Diadochi kingdom of Flag of Thrace Thrace along with the rest of the western Pontic coast. The oldest Greek colony in the region, dating back to the 7th century BC, the city was an early center of trade for the Thracian tribes but eventually superseded by newer cities such of Flag of Apollonia Pontica Apollonia Pontica and Flag of Mesembria Mesembria. Coming under Flag of Rome Roman rule in the 1st century AD after the Flag of Getia Getae were decisively defeated, the city went into a slow decline as its port silted up, and was eventually destroyed by barbarian invasions at the end of the classical era.


Main article: Greek missions#The Hospitable Sea

Should it manage free itself from Thracian suzerainty, Istros has access to the unique Euxine Sea Hellenistic cultural mission tree The Hospitable Sea due to its Bosporan culture, directing it to expand its influence and dominate the Euxine Sea region. Like most other Hellenistic group countries, if Istros 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, Istros also has access to the generic missions at all times.


As Istros has Hellenistic primary culture, it can take the decision to reunite Alexander the Great's empire and form the Flag of Hellenistic Empire Hellenistic Empire if it controls the required territories. This, however, will require Istros 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 Hellenistic Empire Hellenistic Empire
  • Has at least 1 territory
  • Country is in the Hellenistic culture group
  • Is a monarchy
  • Is not Flag of Hellenistic Empire Hellenistic Empire
  • Is not AI-controlled or has more than 40 territories
  • Flag of Hellenistic Empire Hellenistic 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)
    • Athenai (416)
    • Lysimacheia (350)
    • Sardeis (292)
    • Alexandreia (516)
    • Memphis (500)
    • Gaza (659)
    • Tyros (743)
    • Antigoneia (790)
    • Ammoneion (5537)
    • Babylon (918)
    • Seleukeia Megale (911)
    • Persepolis (4799)
    • Ekbatana (1595)
    • 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
  • If the country was originally a republic:
    • If the country originally had the Enact law cost modifier.png Provisioning Act or Enact law cost modifier.png Punic Reforms law, enact the Enact law cost modifier.png Royal Guard law
    • Otherwise, if the country originally had the Enact law cost modifier.png Military Modernization or Enact law cost modifier.png Marian Reform law, enact the Enact law cost modifier.png Royal Army law
  • Get the modifier Argead Unification until the end of the game, giving:
    • Unintegrated culture group happiness +6% Unintegrated Culture Group Happiness
    • Land morale recovery.png +5% Morale of Armies
    • Diplomatic reputation.png +2 Diplomatic Reputation
    • Freeman happiness +8% National Freeman Happiness
  • Get Province investment 5 free province investments
  • Current country becomes Flag of Hellenistic Empire Hellenistic Empire
  • If the current ruler has the Blood of the Argeads Blood of the Argeads trait, set the country's name to 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 et Paphlagonia, Cappadocia Taurica, Phrygia, 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


Main article: A New Philhellenic Policy mission events

Pontic revolt events[edit]

If the Heirs of Alexander DLC is enabled, the other Diadochi will get events to sponsor revolts among Flag of Thrace Thrace's feudatory subjects on the coast of the Pontic sea if they are at war. Up to three of the city states may be contacted, and if they accept they will band together to declare a war of independence against Flag of Thrace Thrace, reflecting the historical revolt of the Pontic Pentapolis during the early part of Lysimachus's reign. This can happen up to once every 7 years, unless the cities are appeased or annexed through Flag of Thrace Thrace's unique A New Philhellenic Policy mission tree.


Istros begins as a Vassalized.png feudatory of Flag of Thrace Thrace.


Istros begins with a Population.png population of 23 pops at the beginning of the game across its Local.png 3 territories. The population is split between Zalmoxian Getian, and Hellenic Bosporan and Getian pops.

The population type breakdown is listed below:

  • Pop noble.png 1 Noble
  • Citizens 4 Citizens
  • Freemen 2 Freemen
  • Tribesmen 11 Tribesmen
  • Slaves 2 Slaves


Pan-Hellenic League icon
Pan-Hellenic League
As any Greek Republic, own the entire region of Greece.
On the Measure of the Earth icon
On the Measure of the Earth
As any Greek nation, build Towers in Omboi and Alexandria.