You're that Princess, looking for her Prince, so you can expand your Kingdom. Then come 100 knights at once and none of them quite make the fit... They can't even get passed your Dragon at the gate when you spot them from the tower.
You put that Dragon there to stop weak knights from getting through, you only want the best to save you and you have an assault course of tests that they have to pass before you'll even give them a kiss... Because if they're not worth it, thank you, next.