Eastern Roman Great Projects

Uploaded · Published February 2, 2026 · Updated June 3, 2026

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Author: Srecko

Last revision: 27 May at 20:49 UTC (8)

File size: 10.61 MB

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Description:

UPDATED FOR 1.19.0.6 (latest game version)

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MANY THANKS TO THE CK3 MOD CO-OP DISCORD SERVER, IT’S AUTHORS AND MEMBERS, FOR THE INVALUABLE ADVICE AND FRIENDLY SUGGESTIONS. YOU PEOPLE ARE AWESOME!

I AM VERY GRATEFUL TO @Biazonx FOR HIS GREAT CONTRIBUTION TO THE PAULICIAN HERESY WAR REWORK

MANY THANKS TO DAEDALUS FOR HIS CONTRIBUTION TO THE ANATOLIAN BEACON SYSTEM PROJECT!

The weight of centuries presses down upon the Eagle’s wings. The Roman Empire, though still the envy of the world, is beset by enemies from all sides and decay from within. Its legendary walls crumble, its ancient roads fracture, and its heartlands lie exposed to the wolves at the gate. Mere survival is not enough. To endure, the Empire must be rebuilt, refortified, and reborn in fire and stone.

This mod introduces a host of new, deeply immersive challenges and strategic opportunities for the Byzantine Empire, centered around a series of unique Great Projects and dynamic, narrative-driven events. It is a test of your treasury, your armies, and your will to rule.

RESTORE THE FOUNDATIONS OF THE EMPIRE

Invest your wealth and foresight into monumental Great Projects designed to restore the Empire’s failing infrastructure and secure its most vulnerable frontiers.

Theodosian Walls Maintenance

The legendary fortifications that defied Huns and Arabs are not a magical barrier; they require constant upkeep. This Great Project simulates the vital maintenance for the Theodosian Walls, preventing their decay and ensuring they stand firm to repel even the mightiest sieges. Neglect spells ruin.
Restore and Improve Imperial Roads

The Via Egnatia and Via Militaris are the arteries of Roman power in the Balkans. Commission elite engineers to restore their foundations and improve their reach. Rebuilt roads allow for safer travel, more efficient supply, and greater control over your restless provinces.
Fortify the Aegean Coast

With Crete lost to a pirate Emirate, Imperial coastlines are defenseless against relentless plunder. Undertake this monumental defense project to build a network of watchtowers and naval bases, reclaiming the security of the seas and ensuring the Empire’s vital islands remain beyond the reach of the corsair’s torch.
Fortify the Eastern Frontier

The East is bleeding. Relentless raids have shattered Anatolia, Armenia, Pontus, and Syria. Through four unique Great Projects, you can commit your treasury to a series of monumental defensive works designed to neutralize threats, restore regional stability, and reclaim the lost prosperity of the Imperial heartland.
Mount Athos Aid

Sustain the spiritual soul of the Empire. Support the Holy Mountain through targeted aid, ensuring the safety and longevity of its ancient monasteries. This project preserves the peace of Mount Athos, strengthening the bond between the throne and the Orthodox world.
The Pecheneg Invasion

Brace for a nomadic apocalypse. When the tribes unite, a devastating Pecheneg horde will thunder across the Danube, putting your armies and your leadership to the ultimate test in a realm-defining war for survival.
The Great Slavic Revolt

Whispers of sedition echo through the Balkans. As Georgi Vojteh and Konstantin Bodin conspire to resurrect the Bulgarian Tsardom, you must use every diplomatic and clandestine resource to pacify the region before these sparks of rebellion ignite a catastrophic fire.
The Paulician Heresy

From the fortress of Tephrice, the "Golden-hand" leads a defiant new realm against Imperial decree. Launch a military campaign to crush this insurrection, followed by a grand resettlement project to dismantle their strongholds and restore the light of Orthodoxy to the frontier.
And much more….

NEW UPDATE IS OUT!!!

NEW UPDATE!!

This update introduces new Great Projects, alongside with many smaller additions, fixes and balances.
- Great Project: Strengthen Cilician Gates
- Great Project: Restore Patriarchal Seat of Jerusalem
- Great Project: Restore Anatolian Beacon System
- Great Project: Restore the Colossus of Rhodos (available for Greco-Roman pagans)
- Great Project: Refortify Nisibis
- Great Project: Convert Hagia Sophia (available for Greco-Roman pagans)
- Decision: Light the Imperial Beacons (activate the Anatolian Beacon System)
- Decision: Quench the Imperial Beacons (deactivate the Anatolian Beacon System)
- Models: A 3D model for the beacons, lit and unlit versions (courtesy of PiGu – author of Medieval Arts, commissioned by Daedalus)
- Activity: Spiritual Retreat in Jerusalem
- Men at Arms: Cilician Akritai
- Events: 50+ new events
- New historical character: Leo the Mathematician (available in 867 start date)
- New Game Rules
Technical Details & Compatibility
- Chinese Localization: https://steamcommunity.com/sharedfiles/filedetails/?id=3090564070
- German Localization: https://steamcommunity.com/sharedfiles/filedetails/?id=3659210644 [OUTDATED]
- Spanish Localization: https://steamcommunity.com/sharedfiles/filedetails/?id=3658804596 [OUTDATED]
- Russian Localization: https://steamcommunity.com/sharedfiles/filedetails/?id=3671713804 [OUTDATED]
- Russian Localization: https://steamcommunity.com/sharedfiles/filedetails/?id=3716011249 [LATEST]
- Low-Impact & High-Compatibility: This mod is designed with a low footprint. No Very few vanilla files are modified. All features are added in such a way to prevent conflicts and ensure maximum compatibility with other mods.
- Great Project Framework: This mod uses the core Great Projects system. It is compatible with any mod that does not fundamentally overhaul or disable this game feature.
- Economic Balance: Project and event costs are balanced around standard vanilla game values. If you use a major overhaul that radically changes the global economy, these costs may feel disproportionate.
IMPORTANT: Save Game Information

While this mod will not crash an existing save, A NEW GAME IS STRONGLY RECOMMENDED.

Many of the key projects, decisions, and event chains are initialized at the start of a new campaign. Loading this mod into an ongoing playthrough may cause these features to be missing or to not function correctly.

[IMPORTANT ANNOUNCEMENT]

I’m proud to announce my plans for the future of this mod. There are a bunch of Great Projects that I want to add, and while I cannot promise all of them will be coming in at once, I hope to eventually add them all in. Here are some of the ideas:

-Restore the Patriarchal Seat (available for Jerusalem, Alexandria, Antioch and Rome, once you reconquer them)
-Reinstate the Grain Dole (changed from a decision into a Great Project)
-Rebuild the Anastasian Walls (thanks @HuitziO for the suggestion) IMPLEMENTED
-Restore Via Appia IMPLEMENTED
-Refortify the Limes Germanicus
-Refortify the Danubian Limes IMPLEMENTED
-Reopen the Platonic Academy in Athens IMPLEMENTED
-and further down the line, some ideas for the pagan Roman Empire (Circus Maximus?)

Anyway, lots of ”Re-” in those ideas. Time to rebuild the Empire boys and girls!

Check out Melodies of Eranshahr, my lovely music mod, adding 31 track for the Persian culture.
https://steamcommunity.com/sharedfiles/filedetails/?id=3076887545