When did the medieval ages change?

Answer 1

The medieval era refers to the feudal systems of lords and knights governing peasants in estates. This began after the fall of Rome and was solidified by the vikings forcing peasants to surrender liberty for protection (so much for give me liberty or give me death) and lasted for centuries until Renaissance ideals began to develop nationalist movements to support nations rather than lords. As such the medieval era is officially considered to end with the Renaissance that began with the Crusades that began in the 11th century and was gone everywhere but Russia by the 15th century. If you count serfdom in Russia, the medieval era lingered until 1861.

The Renaissance is generally considerred to have been the end of the Dark Ages though.