A Norman castle is a type of fortification built during the Norman Conquest of England in the 11th century. These castles were primarily constructed using stone and wood, featuring a central keep, defensive walls, and often a moat. Their design aimed to provide protection and demonstrate power. The most famous example of a Norman castle is the Tower of London, which served as a royal palace and prison. These castles played a crucial role in the military and political landscape of medieval Europe, influencing the development of castle architecture in subsequent centuries.