Multiple choice When were most castles built? The Viking Age (800-1066) The late Middle Ages (1066-1500) The Protestant Reformation (1517-1648) The Enlightenment (1700s-1800s) Reveal answer Fill a bubble to check yourself B Correct answer Explanation While castle building began earlier, the height of stone castle construction in Europe occurred during the late Middle Ages, particularly from the 11th through the 15th centuries.