Barons who received their title from the Holy Roman Emperor are sometimes known as “Barons of the Holy Roman Empire” (Reichsfreiherren), in order to distinguish them from other barons, although the title as such was simply Freiherr. Since the dissolution of the Holy Roman Empire in 1806, Reichsfreiherren do not at present belong to the noble hierarchy of the realm. By a decision of the Congress of Vienna in 1815, their titles were nonetheless officially recognised. From 1806 the then independent German monarchies, such as Bavaria, Württemberg and Lippe could create their own nobility, including Freiherren (although the Elector of Brandenburg had, as king of the originally exclusively extraterritorial Prussia even before that date, arrogated to himself the prerogative of ennoblement). Some of the older baronial families began to use Reichsfreiherr in formal contexts to distinguish themselves from the new classes of barons created by monarchs of lesser stature than the Holy Roman Emperors, and this usage is far from obsolete.