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Empire Legacy of the World War

"What if Germany had won World War 1?"

The Kaiserreich 4 Team are proud to present the most popular alternate history mod for Hearts of Iron II, Darkest Hour, and Hearts of Iron IV! Originally conceived by Sarmatia in 2005, Kaiserreich has since developed into one of the most in-depth alternate history mods, with thousands of unique events, graphics, countries and even mechanics! Rewrite history (again), but this time in Hearts of Iron IV!


  • An immersive alternative history scenario
  • A completely new political system including party popularity and ministers
  • A reworked map with new states and provinces
  • Ten different ideologies
  • Tens of thousands of new events that offer a wide range of different possibilities
  • Hundreds of decisions both generic and nation specific
  • Over 100 focus trees including dynamic trees that change during the game
  • Coloured portraits for every country leader and military leader
  • Hundreds of companies and ministers for all countries
  • Custom UI giving more options and more information
  • Thousands of handmade GFX for ideas, focuses and more
  • Dozens of 3D models

The Future

  • Even more events, decisions and other content
  • Focus trees for every starting nation
  • Reworked and improved older trees


Bug Reporting

Kaiserreich for Hearts of Iron IV is still in early development so there will be bugs, please report any you find

Please don't report them anywhere else, it makes our lives much easier when all bug reports are in one place. Make sure to give as much detail as possible and to double check no-one has reported your issue already.

Our Wiki

More information such as an FAQ, progress reports on upcoming content, complete change notes, the full timeline


Our Discord

Want to meet KR fans just like yourself? Talk with the developers? Get the first word on new updates?

Team Recruitment

We are always looking for talented testers, coders, artists, translators and more. If you would like to join the team and help create the next version of Kaiserreich, head to our discord and check out the #recruiting channel for more information.

Thanks all for playing and we hope you enjoy!

- The Empire team


vBETA 0.27.4a - Released 2023-11-08

Emergency fix for demobilisation bug.

vBETA 0.27.4 - Released 2023-11-07


v46 - Released 2023-10-20

v45 - Released 2023-10-18

v44 - Released 2023-10-18

v43 - Released 2023-10-12

v42 - Released 2023-10-10

Emergency fix for Russian MIO's not working.

v41 - Released 2023-10-10

Version 0.27, updated to AAT and Stella Polaris 1.13. See wiki for full changelog.

v40: BETA 0.26.2 - Released 2023-09-29

v39 - Released 2023-08-03

vv38 - Released 2023-07-20

v37 - Released 2023-06-06

v36 - Released 2023-06-02

v35 - Released 2023-05-29

v34 - Released 2023-04-13

v33 - Released 2023-04-02

v32 - Released 2023-03-09

v31 - Released 2023-02-16

v30 - Released 2023-02-13

v29 - Released 2022-12-18

v28 - Released 2022-12-04

v27 - Released 2022-11-17

v26 - Released 2022-11-11

v25 - Released 2022-11-03

v0.22.3 - Released 2022-10-18

v0.22.2 - Released 2022-10-15

v22 - Released 2022-09-01

v0.21.3 - Released 2022-07-27

v0.21.2 - Released 2022-06-29

v0.21.1 - Released 2022-06-18

v0.21 - Released 2022-06-17

v17 - Released 2022-02-21

v16 - Released 2021-10-18

v15 - Released 2021-09-13

v14 - Released 2021-08-31

v13 - Released 2021-07-14

v12 - Released 2021-06-03

v11 - Released 2021-04-17

v10 - Released 2021-01-31

v9 - Released 2021-01-17

v8 - Released 2020-11-30

v7 - Released 2020-11-16

v6 - Released 2020-11-07

v5 - Released 2020-10-19

v4 - Released 2020-09-23

v3 - Released 2020-07-19

v2 - Released 2020-05-11


Hearts Of Iron IV

Hearts Of Iron IV

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