In almost every kingdom, Rhizel's knights, a step below the nobility, are themselves divided into noble and commonfolk. Knights born to noble lineages are expected to do great deeds for their house, while those less fortunate have fought, killed, studied, trained, bowed, and scraped to get to where they are today.
Some might say the latter are the better fighters by virtue of experience alone. They are often correct, though Rhizeli nobles would refute this.