The term "Prince of Orange" refers to a title historically associated with the rulers of the Principality of Orange, a region in southern France. The title became prominent in the 16th century with William of Orange, who played a key role in the Dutch struggle for independence from Spanish rule. The title has since been held by various members of the House of Orange-Nassau, the Dutch royal family. In modern times, the title is often linked to the current monarch of the Netherlands, who is known as the King of the Netherlands. The title "Prince of Orange" is traditionally given to the heir apparent, symbolizing the connection to Dutch history and heritage.