"The middle ages (5th 15th Centuries AD), often termed The Dark Ages, were actually a time of great discovery and invention."
The Dark Ages were the period of about 500 years following the collapse of the Western Roman Empire circa 400 AD. They were a time of ignorance and superstition and most peoples lives were difficult, brutish and short.
They were followed by the High Medieval Period from 1000 AD to circa 1400 AD. This was a bit better due to the warming trend allowing a longer growing season as well as the introduction of field rotation which produced an abundance of food.
The Medieval Period was noted for the constant persecution, wars, inquisitions, genocide, Crusades and other atrocities committed by the Christian Church(es).
No major political or social changes occurred until the Renaissance and the Enlightenment.