The Middle Ages — a historical period (in Europe generally, and in Japan often referring to the Kamakura and Muromachi periods) characterized by feudal structures.
この城は中世に建てられたと伝えられている。
It is said that this castle was built in the Middle Ages.
中世のヨーロッパ文化を専攻している学生が多い。
There are many students majoring in medieval European culture.