Who invented medieval art?

Answer 1

No one invented Medieval art. It is a term art historians have given to art created during the time period of roughly 400 to 1000 AD, also known as the Migration Period. Often the terms Middle Ages and Medieval are used interchangeably.

Answer 2

Nobody "invented" knights. Like most other aspects of medieval life they evolved from what had gone before and were an integral part of the feudal system.

The word "knight" derives from Old English (the language of the Saxons) cniht, meaning a boy, servant, attendant or young man. It was first used to mean the military vassal of a king in about 1100 AD, but the more widespread term was Latin miles(mee-lays), a soldier.

Mounted armoured troops had been used by the Romans and later the Carolignians; it was normal for such men to be wealthy and have better equipment and weapons than other troops. From this it was a simple matter of evolution to the Norman and French knights of the 11th century and the idea of a religious knighting ceremony, with spurs and sword indicating knightly status. Nobility and knighthood quickly became associated and led eventually to the introduction of heraldry (from the 1140s in England).