There are some warriors who envision themselves King. The folks at the SCA handed out the title of King as a joke prize, because 'no could raise sword to king', thus your elminatated for three months automatically if your really the best sword. The rest of the kingdom gets to fight, you don't.

One thing that seems pretty constant, in all cultures you could be a solidier by just getting pay for it, but to be a warrior or Champion, you had to have some class - dance, music, culture, language because you also had the money to afford the weapons and armor. So it seems that the warrior class ends up being the king class since they are the one protecting the money not you.