Five crowns were created to bind together five regions into a single powerful kingdom, while a sixth crown was created to control the five.
Pity that someone went and destroyed the Crown of Crowns
Want to avoid fighter types focusing on swords? Make Longswords and Bastardswords the weapon of the Noble class, with a death penalty for other to carry. These weapons will be ornate and finally crafted. Adventurers will be stuck with cheaply made broad and shortswords, while professional fighters might use two handed swords.