I know that within Knight culture there are so many aspects of honour and expected behaviours. Certain things like challenges where people can resolve problems in single combat. I'm sure it is quite colourful amongst knights with all these movies we watch but the barbarians had their warrior codes too. Any recommended reading on this? I'm sure Knights regard Barbarians as lacking such civil behavior, but amongst all warrior castes they always had similar rules about single combat engagements and all.