New Strategy You All should Try, It's WAY FUN
Lately, in order to make my strategy a little bit different, I try to capture ALL my enemies sovereign after I've taken their last city. Sometimes you need to draw them out of their last city before you take it or else they disappear forever. What's cool about this strategy is, it's a great source of gold, because you can sell all the sovereign's extra gear netting 1000-3000 gold per sovereign. I tend to role play, so I attack those of the opposite faction first and then use them in my cities to lower unrest and as rearguards. Those of the same faction I accept as my our hero, I equip them, level them up and use them to strengthen my kingdom or to explore. FUN STUFF, try it you'll like it!