Chivalry and bushido were both post-facto inventions; knights in the middle ages did not have a “code of chivalry”, and neither did samurai obey the principles of bushido. Those were invented by Renaissance authors and imperial Japanese historians, respectively; the former as a way to poke fun at those dumb folks that lived prior to their time (not something unknown to today’s people

), and the latter as a way to glorify and imperial-ize their heritage.
Book of Five Rings, Miyamoto Musashi. This man was a swordsman, not a renaissance author and in no way, imperial historian.
samurai-archives.com/musashi.html
In his book, Musashi mentions Bushido. It existed and was not some made up thing.
britannica.com/EBchecked/topic/86168/Bushido
History does not support your position, or at least what recordings I could find under 30 seconds online. I own the book of Five Rings.
I don’t qualify myself as an expert in any way, but if you want to mention historical fact, it’s best that you
back it up.
Bushido is not Chivalry, but a disciplined way of life - or so from my studies. Chivalry has always been a particular set of characteristics or behaviors one should have when conducting oneself, but this did not include disciplines such as art, swordsmanship, etc. there are differences, and that is why I added “dedication (to discipline).” It was the best way I could explain it in a short sentence. If anyone wanted to read further, a link was provided.
That being said. There were some commonly accepted ideas about what a Christian soldier should be, in the middle ages. There’s this very interesting document called the Heliand, which was an old Saxon translation/abbreviation of the Gospels – but because the language was so primitive, Jesus is the “great chieftain” and the apostles are the “king’s warchiefs”, all military language. A lot of the material is simply fabricated by the translator, but this gives us some ideas of what the ideal soldier was in Charlemagne’s time: strong and cunning, but most of all obedient to one’s liege and God. But not so much about being honorable, courting princesses, or any of that stuff.
Charlemagne was king of the Franks, was he not? that is not the same area, nor culture as the saxons. So a substance of text translated into another language and culture is only going to be expected to be adequate (like the original) if done by the proper people. Otherwise, there will be differences.
The saxon perspective may be interesting, but for now I am not interested in historical significance. Instead I wish to pursuit any and all disciplines or life systems similar to Bushido that may have existed in Western society with a Catholic vision/focus. Timeline? I don’t care so much as to when this may have been.