Seleukid Empire

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Major powerSeleukid Empire
Seleukid Empire.png
Primary culture
Macedonian (Hellenistic)

Capital province
Seleukeia Megale (911)

Aristocratic Monarchy

State religion
Military traditions
Flag of Seleukid Empire Heritage of Seleukos

Happiness for wrong culture group modifier.png +6% Unintegrated culture group happiness
Ruler popularity gain.png +0.04 Monthly ruler popularity gain
Pop assimilation.png −15% Pop Assimilation Speed

The Seleukid Empire is a Major Power in the Middle East and one of the main Diadochi kingdoms that has emerged from the fall of the Flag of Argead Empire Argead Empire, centered in Mesopotamia and controlling all of the eastern Satrapies all the way to Bactria and Arachosia, encompassing about half of the former Argead Empire. With 3172 pops spread over 383 territories and a number of subject nations, including three large satrapies to the east, it is one of the wealthiest, most populous, and most powerful countries in the game, though one whose population is almost entirely of a different culture group and religion from the Macedonian ruling class. With the Flag of Antigonid Kingdom Antigonid Kingdom vulnerable and likely to end up at war with all of the other Diadochi soon after game start, the Seleukids are well positioned to destroy their Antigonid rivals and claim the rich territories of the west - though only if they can keep the rising Flag of Maurya Mauryans, restless populace, and Scythian tribes at bay. Historically the Seleukids would conquer much of Syria and Anatolia after the fall of the Flag of Antigonid Kingdom Antigonids and Flag of Thrace Thrace to control nearly all of the Asian part of the Flag of Argead Empire Argead Empire, but would be weakened by devastating civil wars and see most of their territory lost to 20px Parthia and Flag of Pergamon Pergamon before their final rump state in Syria was annexed by Flag of Rome Rome.


Main article: Country rename events

As a dynamically named country, the name of the Seleukid Empire can and usually will change at some point during the game. If the ruling dynasty changes or the country is no longer a monarchy, the former Seleukid Empire will receive an event to break with its dynastic traditions and naming, allowing the country to choose between renaming itself the Persian Empire if its capital is in Greater Persia (Persis, Media, Mesopotamia, or Ariana) or taking a more general name based on its capital region (e.g. Syrian Empire, Mesopotamian Empire, Assyrian Empire, etc.).

Apart from that event, the base name of the country will always use the name of the ruler's family and takes the form [RulerDynastyAdjective] Empire, defaulting to Persian Empire as a fallback if the country ceases to exist or has no ruler for whatever reason. This behaviour is also currently active if the country loses a Civil war.png civil war.


Main article: Seleukid missions

With the Heirs of Alexander DLC, the Seleukid Empire has a unique set of 4 missions focusing on Babylon, Syria, Anatolia, and Palestine. If both "Syrian Ambition" and "To the Borders of Egypt" missions are successfully completed, the Diadochi Empire mission becomes available, with a focus on restoring Alexander's empire. Additionally, regardless of DLC, Macedon has access to the generic missions.


Main articles: Diadochi events, Seleukid flavor events

The Wars of the Diadochi[edit]

At start, all the Diadochi states will receive an event that gives them claims on all of the western half of the former Flag of Argead Empire Argead Empire and the special Legacy of Alexander wargoal, allowing them to easily declare war and conquer territory from each other. For the Seleukid Empire, these claims will go away on the death of the first ruler.

Fourth War of the Diadochi[edit]

Shortly after the game starts, the Flag of Antigonid Kingdom Antigonid Kingdom will receive an event to make an ultimatum against Flag of Macedon Macedon, demanding they retreat from their remaining holdings in Greece. If war breaks out, after a few months Flag of Egypt Egypt may join the fray and demand territorial concessions or go to war; afterwards the Seleukid Empire will also receive an event that will let them directly declare war on the Flag of Antigonid Kingdom Antigonids or present an ultimatum to cede most of Syria, including their capital of Antigoneia, in exchange for peace. Flag of Thrace Thrace will also receive a similar event to make demands or enter the war a few months afterwards.

The Seleukid-Mauryan War[edit]

At the beginning of the game, the Seleukids must also decide how to resolve the ongoing war with Flag of Maurya Maurya, which has recently expanded into the former Indian satrapies of the Flag of Argead Empire Argead Empire. The Seleukids can choose to either sue for peace and cede control over some of their eastern provinces as well as the satrapy of Flag of Arachosia Arachosia for an extended truce, some war elephant units, and a bonus to Siege ability siege ability in order to focus on the west, or press onwards and get claims on the neighboring Indian regions (Gandhara and Maru), which will lead to renewed war in the east.

Parthian hordes[edit]

After the unification of the Dahaean hordes sometime after 480 AUC, the Dahaean leader will receive an event to launch a raid on a Seleukid border patrol led by the Basileus himself. If they choose to go ahead, they will immediately declare war and kill the Seleukid leader, giving the Seleukids a significant malus to Unintegrated culture group happiness unintegrated culture group happiness and Loyalty.png character loyalty to compound the instability from succession, which may quickly lead to civil war amidst the invasion.


The Flag of Seleukid Empire Seleukid Empire has two country-specific decisions around moving the capital to the city of Antiocheia (the former Antigoneia, capital of the Flag of Antigonid Kingdom Antigonid Kingdom at start) and improving its nearby port of Seleukia Pieria. The decisions can be found in /ImperatorRome/game/decisions/seleucids.txt.


A Mediterranean Capital!

For too long the rightful heirs of Alexander's empire have been disconnected from the Macedonian heartland which bore the greatest conquest of history and all the fortunes of our people. Fertile Babylonia has served us well, but we must restore our ties with the lost lands to the west and establish a central point of governance on the Mediterranean if we are to succeed in re-claiming the lands of Megas Alexandros.

Potential requirements
  • Owns at least 1 territory
  • Is Flag of Seleukid Empire Seleukid Empire
  • Has not yet enacted this decision
  • Has more than Wealth 400 gold
  • Owns Antigoneia (790)
  • Owns or has subjects that own the provinces of Syria, North Phoenicia, and Apamea

  • Lose Wealth 400 gold
  • Move the capital to Antigoneia (790)
  • Make the capital a city if it is currently a territory
  • Antigoneia (790) gets the modifier Antioch on the Orontes until the end of the game, giving:
    • Tax income.png +10% Local Tax
    • Population capacity +15% Population Capacity
    • Civilization.png +10% Local Civilization Level
    • Migration attraction +2 Migration Attraction
    • Pop assimilation.png +0.10 Pop Assimilation Speed
  • Add Citizens 8 citizen pops, Freemen 6 freemen pops, and Slaves 4 slave pops to Antigoneia (790)
  • Get Province investment 4 free province investments

A port for Antioch!

With a new focus towards the Mediterranean and the moving of the Seleukid capital to Syria the need for a new great port in Syria has grown ever more urgent. Let us pool our resources to expand the port of Seleuika Pieria and work for the establishment of Seleukid hegemony in the west.

Potential requirements Allow
  • Has more than Wealth 200 gold
  • Owns Hydatos Potamoi (789)
  • Owns Antigoneia (790)
  • Antigoneia (790) is the capital

  • Lose Wealth 200 gold
  • Hydatos Potamoi (789) gets the modifier Seleukia on the Sea until the end of the game, giving:
    • Tax income.png +10% Local Tax
    • Global population growth.png +0.10% Local Population Growth
    • Civilization.png +10% Local Civilization Level
  • Add Citizens 8 citizen pops, Freemen 6 freemen pops, and Slaves 4 slave pops to Hydatos Potamoi (789)

As one of the easternmost Hellenistic states, the Seleukid Empire can take the decision to move their centre of power to Northern India and embrace greater cultural syncretism if they make conquests in the region, representing the historical creation of the Indo-Greek kingdoms.


An Indo-Greek Kingdom

The lure of friends, empires, and riches to the East leads many of our people to the realization that fighting over the scraps of Alexander's Empire, may not be a goal worth pursuing. Greater glory lies in tying our destiny to the land beyond the Indus.

Potential requirements Allow
  • Owns all territories in the Madra area

  • Move the capital to Sakala (4340) and make it a city if it is currently a territory
  • Change the name of Sakala (4340) to Euthymedeia
  • Add Citizens 4 citizen pops, Freemen 4 freemen pops, and Slaves 4 slave pops to the capital
  • Get the modifier By the Indus until the end of the game, giving:
    • Unintegrated culture group happiness +6% Unintegrated Culture Group Happiness
    • Diplomatic reputation.png +2 Diplomatic Reputation

Finally, as a Hellenistic culture group monarchy, the Seleukid Empire also has access to the decision to form the Flag of Argead Empire Argead Empire.


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

Combined with the modifiers from Seleukid Empire's unique heritage (which gives among other things Unintegrated culture group happiness +6% Unintegrated Culture Group Happiness), if the Seleukid Empire manages to take both of these decisions it can accumulate one of the highest Unintegrated culture group happiness unintegrated culture group happiness modifiers in the game, making dealing with foreign conquests and Aggressive expansion.png aggressive expansion much easier.


The Seleukid Empire starts off as an Aristocratic Monarchy that is ruled by Basileus Seleukos Nikator Seleukid (13 Military power.png Martial/14 Civic power.png Finesse/8 Oratory power.png Charisma/6 Religious power.png Zeal), of the Seleukid family. The Seluekid family have the Blood of Seleukos which grants +1 Civic power.png Finesse and +20 Prominence.png Prominence to all characters and if the ruler has this trait then the state gets +0.05 Province loyalty Provincial Loyalty and a −25% discount to Change governor policy cost Change Governor Policy Cost. Obviously it would be best to make sure all characters that occupy the throne should have this trait.


The Seleucid Empire has no allies, but six subjects, in 450 AUC. As long as they remain loyal they will provide a significant amount of military support, particularly with any wars in the east.

3 satrapies:

1 client state:

2 tributaries:

Additionally, the Seleukid Empire borders the Diadochi kingdom of the Flag of Antigonid Kingdom Antigonid Kingdom to the west (along with its subjects of Flag of Commagene Commagene and Flag of Cappadocia Cappadocia), Flag of Armenia Armenia and Flag of Atropatene Atropatene to the north, Flag of Maurya Maurya to the east, and 20px Gerrha and Flag of Maka Maka to the south.


The Seleukid Empire starts with the following pantheon:

  • War: Apollo (Hellenic)
  • Economy: Nabû (Chaldean)
  • Culture: Marduk (Chaldean)
  • Fertility: Artemis (Hellenic)

Later on in their mission trees the Seleukids can unlock Apollo Didymaios, which is normally restricted to Flag of Syracusae Syracusae.


The Seleukid Empire has Population.png 3172 Population at the beginning of the game, divided across Local.png 383 territories. Most of the Iranian plateau is Zoroastrian and in the Iranian culture group, comprising the majority of the Seleukid population at start (about 65.6%). Pops in the Aramaic culture group, split between Assyrians in the north and Babylonians in the south, dominate in Mesopotamia and largely follow the Chaldean religion, making up some 26% of the population and most of the capital region population. Only about 12% of the population follows the state culture and religion, with Macedonian Hellenic pops concentrated in the some of the major cities and recently founded Alexandrian colonies. Smaller negligible minorities of Qedarite Arabic and Hebrew Jewish pops also exist scattered throughout Mesopotamia, as well as Armenians and Cappadocians along the northern borders.

Population Types:

  • Pop noble.png 36 Nobles (1.13%)
  • Citizens 541 Citizens (17.06%)
  • Freemen 910 Freemen (28.69%)
  • Tribesmen 736 Tribesmen (23.20%)
  • Slaves 948 Slaves (29.89%)

Cultural privileges[edit]

  • Babylonian (Aramaic) - Integrated.png Integrated culture, Citizens Citizen rights
  • Persian (Iranian) - Integrated.png Integrated culture, Citizens Citizen rights
  • Median (Iranian) - Protected Inheritances


At the beginning of the game, there is a decision for the Seleukid Empire: if they want to wage war against Flag of Maurya Maurya, or give them the eastern part of the empire for ten years of peace and five cohorts of war elephants. There is the possibility to go into war with Flag of Maurya Maurya and offer them peace immediately by giving up the subjects Flag of Bactria Bactria and Flag of Tylos Tylos. But it is recommended to give them the land and take the elephants like Seleukos did historically. Firstly, a war against Flag of Maurya Maurya is very difficult in the Seleukid Empire's situation in 450 A.U.C., as all your troops are at the other side of your country and the Flag of Maurya Mauryans have a much stronger army and economy at the start. Secondly, Flag of Bactria Bactria as a Subject will become very important, primarily due to the tribute they pay to you each month. Later in the game, you will not have too much trouble with Flag of Maurya Maurya, but especially in the beginning, they might be a problem. Thirdly, you can concentrate on gaining territory in the west, which is much easier and much more valuable at the start. You can occupy land in the Flag of Antigonid Kingdom Antigonid Kingdom pretty easily, as they are usually at war with all of the other Diadochi some years after the start. If you win against them, you can gain territory with Hellenic population, which affects the stability of your country in a positive way. The majority of your population at the start do not share the same culture and religion as your leader, and especially after you rack up some aggressive expansion, you have to be careful not to let a civil war break out.


To the End of the World icon
To the End of the World
As the Seleucid Empire or Bactria, conquer the regions of Gandhara, Mahdyadesa, Pracya, Maru, and Avanti.
No More Worlds Left to Conquer icon
No More Worlds Left to Conquer
Reform Alexander's Empire as a successor state.
Nikator icon
As the Seleucid Empire, conquer Pella before the death of Seleucus Nikator.