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). Sometimes legendary or fictional persons are included. For example, the Swedish kings Eric XIV (reigned 1560–68) and Charles IX (1604–11) took ordinals based on a fanciful 1544 history by Johannes Magnus, which invented six kings of each name before those accepted by later historians. A list of Swedish monarchs, represented on the map of the Estates of the Swedish Crown, produced by French engraver Jacques Chiquet (1673–1721) and published in Paris in 1719, starts with Canute I and shows Eric XIV and Charles IX as Eric IV and Charles II respectively; the only Charles holding his traditional ordinal in the list is Charles XII. Also, in the case of Emperor Menelik II of Ethiopia, he chose his regnal number with reference to a mythical ancestor and first sovereign of his country (a supposed son of biblical King Solomon) to underline his legitimacy into the so-called Solomonic dynasty.
Examples of monarchical ordinals Monarchs with the same given name are distinguished by their ordinals:
Kings Umberto I and Umberto II of Italy Empresses Catherine I and Catherine II of Russia Princes Rainier II and Rainier III of Monaco Popes Benedict XV and Benedict XVI Ordinals may also apply where a ruler of one realm and a ruler of that realm's successor state share the same name:
Queens Elizabeth I of England and Elizabeth II of the United Kingdom Kings Alfonso XI of Castile and Alfonso XII of Spain Kings Victor Emmanuel I of Sardinia and Victor Emmanuel II of Italy Kings Peter I of Serbia and Peter II of Yugoslavia
Double names Practice varies where monarchs go by two or more given names. For Swedish monarchs, the ordinal qualifies only the first name; for example, Gustav VI Adolf, known as "Gustav Adolf", was the sixth Gustav/Gustaf, but the third Gustav Adolf. By contrast, the Kingdom of Prussia was ruled in turn by Friedrich I, Friedrich Wilhelm I, Friedrich II, and Friedrich Wilhelm II; and later by Wilhelm I. Likewise Pope John Paul I, who chose his double name to honour predecessors John XXIII and Paul VI, and was succeeded by John Paul II.
Ordinals for non-reigning royalty In any case, it is usual to count only the monarchs or heads of the family, and to number them sequentially up to the end of the dynasty. A notable exception to this rule is the German House of Reuss. This family has the particularity that every male member during the last eight centuries was named Heinrich, and all of them, not only the head of the family, were numbered. While the members of the elder branch were numbered in order of birth until the extinction of the branch in 1927, the members of the younger line were (and still are) numbered in sequences that began and ended roughly as centuries began and ended. This explains why the current (since 2012) head of the Reuss family is called Heinrich XIV, his late father Heinrich IV and his sons Heinrich XXIX and Heinrich V. It is rare, but some German princely families number all males whether head of the family or not; for example, Hans Heinrich XV von Hochberg was preceded as Prince of Pless by Hans Heinrich XI and succeeded by Hans Heinrich XVII; the ordinals XII, XIII, XIV, and XVI were borne by von Hochbergs who were not Prince of Pless. Similarly for the House of Reuss, where all men were numbered Heinrichs and some were reigning Princes of Reuss-Gera or Reuss-Greiz. Pretenders and rulers of formerly deposed dynasties are often given regnal numbers as if non-reigning pretenders had actually ruled. For example Louis XVIII of France took a regnal number that implicitly asserts that Louis XVII had been king, though he never reigned; his pretendership was during the French First Republic. A similar case is that of Napoleon III whose regnal number implicitly asserts a ruling Napoleon II. Louis XVIII numbered his regnal year from the death of Louis XVII, something Napoleon III never did.
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