Some historians believe, that the Byzantine cataphract was modeled after the Bulgarian, which was in turn modeled after the Sarmatian armored horsemen.
In Volga Bulgaria the evolution of heavy cavlry reached its peak in the unit I am presenting here - on the right you can see a dismounted Bolgar Cataphract reconstruction and on the left my own reconstruction for use in AOK mods and modded campaigns.
The unit is free to use as long as Dave3377 and I are credited. The horse is taken from his Cataphract Archer and the rest of the unit is my design.