The official portraits of King Władysław IV dressed according to French, Spanish and Polish fashion reflects the complex politics of the Polish–Lithuanian Commonwealth during the Thirty Years' War
The history of international relations based on sovereign states is often traced back to the Peace of Westphalia of 1648, a stepping stone in the development of the modern state system. Prior to this the European medieval organization of political authority was based on a vaguely hierarchical religious order. Contrary to popular belief, Westphalia still embodied layered systems of sovereignty, especially within the Holy Roman Empire.[4] More than the Peace of Westphalia, the Treaty of Utrecht of 1713 is thought to reflect an emerging norm that sovereigns had no internal equals within a defined territory and no external superiors as the ultimate authority within the territory's sovereign borders.
The centuries of roughly 1500 to 1789 saw the rise of the independent, sovereign states, the institutionalization of diplomacy and armies. The French Revolution added to this the new idea that not princes or an oligarchy, but the citizenry of a state, defined as the nation, should be defined as sovereign. Such a state in which the nation is sovereign would thence be termed a nation-state (as opposed to a monarchy, or a religious state). The term republic increasingly became its synonym. An alternative model of the nation-state was developed in reaction to the French republican concept by the Germans and others, who instead of giving the citizenry sovereignty, kept the princes and nobility, but defined nation-statehood in ethnic-linguistic terms, establishing the rarely if ever fulfilled ideal that all people speaking