In a related sense, now not commonly used, all more or less sovereign rulers over a state, including kings, were "princes" in the language of international politics. They normally had another title, for example king or duke. Many of these were Princes of the Holy Roman Empire.
in a related sense now not commonly used all more or less sovereign rulers over a state including kings were "princes" in the language of international politics they normally had another title for example king or duke many of these were princes of the holy roman empire