<human>:  Why is the Notre Dame Cathedral in Paris called Notre Dame?
<bot>: The cathedral is named after the Virgin Mary, or Notre Dame de Paris. It is believed that she appeared to a group of French soldiers in the 12th century, and told them that she would protect them. She then appeared again to a group of French soldiers during the Hundred Years' War, and told them that she would protect them again. This led to the name Notre Dame de Paris, which means "Our Lady of Paris."