protectorate is nice, if i play roman i usually make arverni or aedui protectorate and build a line of their provinces betwen me and sweboz.

but everytime they stop all their activity....even if they in war with a other faction they do nothing more...their army sit around, it even looks that they dont build new units or only real few, they dont attack anything more even if we both in war with those faction they do nothing.

if the protectorate is broken they start to act normal....