History of Bulgaria (1878–1946) in the context of "List of Bulgarian monarchs"

The Treaty of Berlin (formally the Treaty between Austria-Hungary, France, Germany, Great Britain and Ireland, Italy, Russia, and the Ottoman Empire for the Settlement of Affairs in the East) was signed on 13 July 1878. In the aftermath of the Russian victory against the Ottoman Empire in the Russo-Turkish War of 1877–1878, the major powers restructured the map of the Balkan region. They reversed some of the extreme gains claimed by Russia in the preliminary Treaty of San Stefano, but the Ottomans lost their major holdings in Europe. It was one of three major peace agreements in the period after the 1815 Congress of Vienna. It was the final act of the Congress of Berlin (13 June – 13 July 1878) and included the United Kingdom, Austria-Hungary, France, Germany, Italy, Russia and the Ottoman Empire. Chancellor of Germany Otto von Bismarck was the chairman and dominant personality.

The most important task of the Congress was to decide the fate of Bulgaria, but Bulgaria itself was excluded from participation in the talks, at Russian insistence. At the time, as it was not a sovereign state, Bulgaria was not a subject of international law, and the same went for the Bulgarians themselves. The exclusion was already an established fact in the great powers' Constantinople Conference, which had been held one year before without any Bulgarian participation.

Regnal numbers are ordinal numbers—often written as Roman numerals—used to distinguish among persons with the same regnal name who held the same office, notably kings, queens regnant, popes, and rarely princes and princesses.

It is common to start counting either since the beginning of the monarchy, or since the beginning of a particular line of state succession. For example, Boris III of Bulgaria and his son Simeon II were given their regnal numbers because the medieval rulers of the First and Second Bulgarian Empire were counted as well, although the recent dynasty dates only back to 1878 and is only distantly related to the monarchs of previous Bulgarian states. On the other hand, the kings of England and kings of Great Britain and the United Kingdom are counted starting with the Norman Conquest. That is why the son of Henry III of England is called Edward I, even though there were three English monarchs named Edward before the Conquest (they were distinguished by epithets instead).

The Treaty of Neuilly-sur-Seine (French: Traité de Neuilly-sur-Seine; Bulgarian: Ньойски договор, romanized: Noĭski dogovor) was a treaty between the victorious Allies of World War I on the one hand, and Bulgaria, one of the defeated Central Powers in World War I, on the other. The treaty required Bulgaria to cede various territories.

The treaty was signed on 27 November 1919, in Neuilly-sur-Seine in the Hauts-de-Seine department, just west of Paris in France. The signing ceremony was held in the Hôtel de Ville (town hall) at Neuilly.