An interesting (for me, anyway) note on Cataphracts at the Battle of Carrhae.

It seems that Crassus had brought some Gallic cavalry with him to the battle. When these Gauls realized they had no chance in a stand-up fight against the Parthian Cataphracts, the former would dismount and either grab the long lance of the Parthians and swing them to the ground (making them essentially helpless) or get under their horses and gut them.

I'd pay to see that on the game.