If you actually want to understand medieval world, you need to study their numerology. Any entry book will probably be fine. Most historians today don't understand that numbers to them weren't merely quantities. Gothic Churches had very esoteric numerology behind it. Things weren't built first for use like today. Beauty and Philosophy always came first before secular times.
Medieval law wasn't made up like they are now, they were declared. Much like a mathematician merely states laws already present in the world and has no power to create them. Politics was heavily based on Platonic Realism instead of our current satanic Nominalism.
Knowing this, you'll have better insight than any revisionist idiot who projects enlightenment into the medieval times.
>About WW1:
All you need to understand is that Nikolai II was ritually killed by kikes, much like every satanic republic starting from the French Revolution, which is the killing (beheading) of the Patriarch. This is endorsed by the Russian Orthodox Church and any search on the Internet about it comes up with results about anti-semitism. Their neuroticism points them out.
The natural God given way was fully replaced by british masonic enlightenment in the end of WW1.