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A queen regnant (plural: queens regnant) is a female monarch, equivalent in rank and title to a king, who reigns in her own right over a realm known as a "kingdom"; as opposed to a queen consort, who is the wife of a reigning king; or a queen regent, who is the guardian of a child monarch and rules temporarily in the child's stead, be it de jure in sharing power, or de facto in ruling alone. A princess regnant is a female monarch who reigns in her own right over a "principality"; an empress regnant is a female monarch who reigns in her own right over an "empire".
A queen regnant possesses and exercises sovereign powers, whereas a queen consort or queen regent shares her spouse's and/or child's rank and titles, but does not share the sovereignty of her spouse or child. The husband or child of a queen regnant traditionally does not share the queen regnant's rank, title or sovereignty. However, the concept of a king consort or prince consort is not unheard of in both contemporary and classical periods.
In Ancient Africa, Ancient Persia, Asian and Pacific cultures, and in some European countries, female monarchs have been given the title king or its equivalent, such as pharaoh, when gender is irrelevant to the office, or else have used the masculine form of the word in languages that have grammatical gender as a way to classify nouns. The Byzantine Empress Irene sometimes titled herself basileus (), 'emperor', rather than basilissa (), 'empress' and Jadwiga of Poland was crowned as Rex Poloniae, King of Poland.
Among the Davidic Monarchs of the Kingdom of Judah, there is mentioned a single queen regnant, Athaliah, though the Hebrew Bible regards her negatively as a usurper. The much later Hasmonean Queen Salome Alexandra (Shlom Tzion) was highly popular.
Accession of a queen regnant occurs as a nation's order of succession permits. Methods of succession to kingdoms, tribal chiefships, and such include nomination (the reigning monarch or a council names an heir), primogeniture (in which the children of a monarch or chief have preference in order of birth from eldest to youngest), and ultimogeniture (in which the children have preference in the reverse order of birth from youngest to eldest). The scope of succession may be matrilineal, patrilineal, or both; or, rarely, open to general election when necessary. The right of succession may be open to men and women, or limited to men only or to women only.
The most typical succession in European monarchies from the Late Middle Ages until the late 20th century was male-preference primogeniture: the order of succession ranked the sons of the monarch in order of their birth, followed by the daughters. Historically, many realms[which?] forbade succession by women or through a female line in accordance with the Salic law, and some[which?] still do. No queen regnant ever ruled France, for example. Only one woman, Maria Theresa, ruled Austria. As noted in the list below of widely-known ruling queens, many reigned in European monarchies.
In the late 20th and early 21st centuries, Sweden, Norway, Belgium, the Netherlands, Denmark, Luxembourg and the UK amended their laws of succession to absolute primogeniture (in which the children of a monarch or chief have preference in order of birth from eldest to youngest regardless of gender). In some cases, the change does not take effect during the lifetimes of people already in the line of succession at the time the law was passed.
In 2011, the United Kingdom and the 15 other Commonwealth realms agreed to remove the rule of male-preference primogeniture. Once the necessary legislation was passed, this means that had Prince William had a daughter first, a younger son would not have become heir apparent.
In 2015, Elizabeth II became the longest-reigning queen regnant and female head of state in world history. In 2016, she became the longest currently serving head of state and longest currently reigning monarch.
In China, Wu Zetian became the Chinese empress regnant and established the Zhou Dynasty after dismissing her sons. The Empress Wu used the title huangdi (, "emperor") and in many European sources, is referred to as a female emperor rather than an empress regnant. A few decades earlier in Korea, Queen Seondeok of Silla and Jindeok of Silla developed the term yeowang (, "female king") to refer to themselves, using the title instead of wangbi (), which is usually translated as "queen consort" and refers to the wife of a king or emperor.
Although the Chrysanthemum Throne of Japan is currently barred to women, this has not always been the case; throughout Japanese history there have been eight empresses regnant. Again, the Japanese language uses the term josei tenn? (?, "female imperial ruler") for the position which would be "empress regnant" in English, with k?g? () being the term reserved for an empress consort. The Japanese succession debate became a significant political issue during the early 2000s, as no male children had been born to the Imperial House of Japan since 1965. Prime Minister Junichir? Koizumi pledged to present parliament with a bill to allow women to ascend the Imperial Throne, but he withdrew this after the birth of Prince Hisahito in 2006.
||United Kingdom||6 February 1952|
|Jamaica||6 August 1962|
|Barbados||30 November 1966|
|The Bahamas||10 July 1973|
|Grenada||7 February 1974|
|Papua New Guinea||16 September 1975|
|Solomon Islands||7 July 1978|
|Tuvalu||1 October 1978|
|Saint Lucia||22 February 1979|
|Saint Vincent and the Grenadines||27 October 1979|
|Belize||21 September 1981|
|Antigua and Barbuda||1 November 1981|
|Saint Kitts and Nevis||19 September 1983|
||Denmark||14 January 1972|