Prince of Monaco
Monarchical
The sovereign prince is the monarch and head of state of the Principality of Monaco. All reigning princes and princesses have taken the name of the House of Grimaldi. When Prince Rainier III died in 2005, he was Europe's longest reigning monarch. Wikipedia
Past holders: Albert II, Prince of Monaco, Rainier III, Prince of Mónaco, Albert I, Prince of Monaco, and more