Which brings other questions trailing in its wake.
What sorts of land tenure has this kingdom got? If feudal, has the family still served the king when thrown off their estates? How longer was the Evil Overlord sitting on them? Is the line of the original owner extinct? What sort of inheritance rights would the family have? What if the land is so ruined that the traditional landmarks are all shifted or gone? Did anyone manage to get out with any kind of deed?
Do you want to evade all these questions on the grounds they are No Fun At All? Even then it might be wise to brush over them and the whole question of families and dispossession, at least to make it clear that other people are worrying about it.
One notes, unlike the kinging question, there is no one in possession of the throne -- or a less title -- to argue the point on grounds of having actually taken charge of the land, once you've swept the Evil Overlord away.
You get the same fun and games with the dragon's hoard, assuming parts of it are recognizable. A magic sword, an ornate brooch, a bejeweled crown, even a glowing ruby could probably all be identified, though. Good question would be about salvage rights.