Age of Conquest has been originally released on May 17, 2000. The game has gone to numerous revisions over time. Below a screenshots depicting the various changes.
Emperor (Atari ST)
Not sure if this belongs here, but probably the very first implementation started with “Emperor”, a single player game for Atari ST.
Aevum Obscurum I
The first installment of the game was released under the name Aevum Obscurum (Dark Ages) and supported ONLINE-play only across PC, Mac & Linux. Release data was May 17, 2000.
Aevum Obscurum II (Experimental/3D)
An experimental version of Aevum Obscurum II was produced but never released.
Aevum Obscurum II
The next installment of Aevum Obscurum went live going back to 2D-maps.
Aevum Obscurum II (Updated)
An updated version of Aevum Obscurum II was produced with improved graphics & player avatars.
Age of Conquest III
A resign and port to Android/iOS was implemented featuring much improved graphics. The name was changed to “Age of Conquest”.
Age of Conquest IV
The latest release featuring single player and full cross-platform multiplayer game-play across PC, Mac, Linux, iOS & Android.