I even read that one of their warriors queen faced Aelxander the great sitting on the back of a war elephant and he turns back his army after seeing her army. Also their city of Kush had the best iron of the time and made the best Iron weapons possible. Maybe you can use this fact for the weapons/armoury of the kentake units. There are artifacts displaying a warrior queen with full metalplate armour.
In the campaign map there's still a pirate ship in a river by the city Kangha which influence the popularity of the nearby cities.