A queen regnant (plural: queens regnant) is a female monarch who reigns in her own right, in contrast to a queen consort, who is the wife of a reigning king. An empress regnant is a female monarch who reigns in her own right over an empire.
A queen regnant possesses and exercises sovereign powers. The husband of a queen regnant does not usually share his wife's rank, title or sovereignty. A queen consort shares her husband's rank and titles, but does not share the sovereignty of her husband.
A queen dowager is the widow of a king who reigned in his own right. A queen mother is a queen dowager who is also the mother of a reigning sovereign.
In Ancient Egypt, Pacific cultures, and European countries, as noted below, women monarchs have been given the title king or its equivalent, such as pharaoh, when gender is irrelevant to the office. Also the Byzantine Empress Irene sometimes called herself basileus (βασιλεύς), 'emperor', rather than basilissa (βασίλισσα), 'empress' and Jadwiga of Poland was crowned as Rex Poloniae, King of Poland.
The Queen of Sheba (Hebrew: מלכת שבא, Malkaṯ Šəḇâ in Biblical Hebrew; Malkat Sh'va in Modern Hebrew; Ge'ez: ንግሥተ ሳባ, Nigiste Saba (Nəgəstä Saba); Arabic: ملكة سبأ, Malikat Sabaʾ) was a monarch of the ancient kingdom of Sheba and is referred to in Ethiopian history, the Bible, the Qur'an, Yoruba customary tradition, and Josephus. She is widely assumed to have been a queen regnant, although there is no historical proof of this; in fact, she may have been a queen consort. The location of her kingdom is believed to have been in Ethiopia and Yemen.
The queen of Sheba has been called a variety of names by different peoples in different times. To King Solomon of Israel she was the Queen of Sheba. In Islamic tradition she was called Bilqis or Balqis by the Arabs, who say she came from the city of Sheba, also called Mareb, in Yemen or Arabia Felix. The Roman historian Josephus calls her Nicaule. The Ethiopian people claim her as Makeda or Maqueda. She is thought to have been born sometime in the 10th century BC. Her lineage was part of the Ethiopian dynasty established in 1370 BCE by Za Besi Angabo, which lasted 350 years; Makeda's grandfather and father were the last two rulers of this dynasty. Makeda's mother was known as Queen Ismenie. In 1005 BCE, Makeda's father appointed her as his successor from his deathbed.
Elizabeth II (Elizabeth Alexandra Mary; born 21 April 1926) is the constitutional monarch of 16 sovereign states known as the Commonwealth realms, and head of the 54-member Commonwealth of Nations. She is also head of state of the Crown Dependencies.
Elizabeth was born in London, and educated privately at home. Her father acceded to the throne as George VI in 1936 on the abdication of his brother Edward VIII. She began to undertake public duties during the Second World War, in which she served in the Auxiliary Territorial Service. On the death of her father in 1952, she became Head of the Commonwealth and queen regnant of seven independent Commonwealth countries: the United Kingdom, Canada, Australia, New Zealand, South Africa, Pakistan, and Ceylon. Her coronation service in 1953 was the first to be televised. Between 1956 and 1992, the number of her realms varied as territories gained independence and some realms became republics. Today, in addition to the first four aforementioned countries, Elizabeth is Queen of Jamaica, Barbados, the Bahamas, Grenada, Papua New Guinea, the Solomon Islands, Tuvalu, Saint Lucia, Saint Vincent and the Grenadines, Belize, Antigua and Barbuda, and Saint Kitts and Nevis.