Skip to content
An open source re-implementation of Caesar III
Branch: master
Clone or download


Chat: Gitter

Status Latest release Latest unstable
Windows AppVeyor Download Download
Linux Travis
Mac Travis Download Download
PS Vita Travis Download Download
Nintendo Switch Travis Download Download

Julius is an open source re-implementation of Caesar III.

The aim of this project is to create an open-source version of Caesar 3, with the same logic as the original, but with some UI enhancements, that is able to be played on multiple platforms. The same logic means that the saved games are 100% compatible, and any gameplay bugs present in the original Caesar 3 game will also be present in Julius.

UI enhancements include:

  • Support for widescreen resolutions
  • Windowed mode support for 32-bit desktops

Julius requires the original assets (graphics, sounds, etc) from Caesar 3 to run.

Building from source


  • cmake
  • SDL2
  • SDL2_mixer

After cloning the repo, run the following commands:

$ mkdir build && cd build
$ cmake ..
$ make

This results in a julius executable.

To build the Vita or Switch version, use cmake .. -DVITA_BUILD=ON or cmake .. -DSWITCH_BUILD=ON instead of cmake ...

Running the game

After downloading the Windows build or compiling the game yourself, the game data should be in the same directory as in which the binary is run or it can be run as julius /path/to/game-data.

The easiest way to run the game is to copy either the compiled executable (in case you built it from source) or the contents of the downloaded zip file to your Caesar 3 installation folder. Then run the julius executable as any other program.

Note that you must have permission to write in the game data directory as the saves will be stored there.

See Running for further instructions, including instructions for Linux, Vita, and Switch.

You can’t perform that action at this time.