medievalism

noun

1. the spirit, practices, or methods of the Middle Ages.
2. devotion to or adoption of medieval ideals or practices.
3. a medieval belief, practice, or the like.

noun

1. the beliefs, life, or style of the Middle Ages or devotion to those
2. a belief, custom, or point of style copied or surviving from the Middle Ages

n.1846, from medieval + -ism.