A Prince is the power inheriting son of an Aristocrat. These days they have to be diplomates and managers
Knights are humans that learned the craft of war. Some master it like others the art to paint.
Bandits and Thieves will pretend to be either, using power and war to loot.
The truth is, that you consider a Knight someone in shiny iron body armour
while Knights consider body armour of any kind
part of the tools
in use
to master their craft