Feudalism, believed to be established by William the Conqueror, arose in Europe during the period known as the High Middle Ages, around the start of the 10th century. However, feudalism started at various other times throughout the world.
Feudalism itself refers to a sociopolitical system where a weak monarchy attempts to rule a region or land through reciprocal agreements. Feudalism began after the main control of the Roman Empire disappeared. It was instrumental to the formation of better local defense systems against the dangers that threatened Europe. The height of feudalism occurred during the 11th century, and it flourished in the 12th and 13th centuries. The decline started in the 13th century and continued until about the 15th century, during the rise of the Renaissance.