Western Rome started to fall apart due to loss of wealth and laws and government. It was also being raided and sacked by enemies. Most of the army and defense had quit or moved.
In 600, Egypt had fallen to the Muslims during the dark Ages in Western Europe.
Feudalism was large in medieval times. Feudalism was a pyramid of Kings, Nobles, Knights and peasants. How it worked was the king gave land for protection and the peasants were forced to work on them, keeping some of the produce for themselves.
In the dark ages, everything was centered around the church. Some churches even had their own private army to defend the church if needed
During medieval times, daily life in Western Europe for most people was dirty. People didnt get much dental care, health care, or were really clean.