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An heir apparent is a person, male or female, who is first in line of succession and cannot be displaced from inheriting by the birth of another person. An heir presumptive, by contrast, is someone who is first in line to inherit a title but who can be displaced by the birth of a more eligible heir. Today these terms most commonly describe heirs to hereditary titles, particularly monarchies. They are also used metaphorically to indicate an "anointed" successor to any position of power, e.g., a political or corporate leader. The phrase is only occasionally found used as a title, where it usually is capitalized ("Heir Apparent"). Most monarchies give (or gave) the heir apparent the title of ''Crown Prince'' or a more specific title, such as Prince of Orange in the Netherlands, Prince of Asturias in Spain, or Prince of Wales in the United Kingdom. In France the title was ''le Dauphin''. See crown prince for more examples. This article primarily describes the term ''heir apparent'' in a hereditary system regulated by laws of primogeniture—as opposed to cases where a monarch has a say in naming the heir. == Heir apparent versus heir presumptive == In a hereditary system governed by some form of primogeniture, an heir apparent is easily identifiable as the person whose position as first in the line of succession is secure, regardless of future births. An heir presumptive, by contrast, can always be "bumped down" in the succession by the birth of somebody more closely related in a legal sense (according to that form of primogeniture) to the current title-holder. The clearest example occurs in the case of a title-holder with no children. If at any time he were to produce children, they (the offspring of the title-holder) rank ahead of whatever more "distant" relative (the title-holder's sibling, perhaps, or a nephew or cousin) previously was heir presumptive. Many legal systems assume childbirth is always possible regardless of age or health. In such circumstances a person may be, in a practical sense, the heir apparent but still, legally speaking, heir presumptive. Indeed, when Queen Victoria succeeded her uncle King William IV, the wording of the proclamation even gave as a caveat: :''"...saving the rights of any issue of his late Majesty King William IV, which may be born of his late Majesty's consort."'' This provided for the possibility that William's wife, Adelaide of Saxe-Meiningen, was pregnant at the moment of his death—since such a (so-named posthumous) child, if born and regardless of the gender of the child, would have displaced Victoria from the throne.〔(Proclamations of Accessions of British Sovereigns (1547-1952) )〕 Adelaide was 44 at the time, so pregnancy was possible even if unlikely. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Heir apparent」の詳細全文を読む スポンサード リンク
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