That's what the empire tree on the left hand side is supposed to do.. but at the moment, it's pretty inadequate for the task. It needs to show names at the very, very least. It doesn't show grouped armies, only Sovereign/Champions, which is also something that could seriously use changing.

Speaking of lists of cities: would be nice if we could make and .xml file with names for cities for specific factions so that each time we build a city a pre-determined name pops up as suggestion (ala Civ).