Actually Highland clans kept cattle not sheep, your getting mixed up with the Welsh.
Bah ! Sheep, cows, poultry, it's all pre-processed food to me anyway

This really highlights the problems arising with the lack of regional troop variations in the game. The only way for armies to partially reflect local ethnic groups is to stick to recruiting mercenaries.
True, but then again this downplays cultural variations in the factions themselves - every Western army in the levant would then be made up of Turcopoles and generic spearmen/DFKs/Xbow militas

I must say faction specific units being available everywhere doesn't bother me all that much as a general rule, and it's pretty much already downplayed by the fact that your best and most developped training centers will be where you started, thus your high level faction specific units will come from there anyway... It's just Highlanders that make me tick, probably because their appearance itself is very marked, while say Viking Raiders are just generic white dudes with axes.