Queen Regnant

A queen regnant (plural: queens regnant) is a female monarch, equivalent in rank to a king, who reigns in her own right, in contrast to a queen consort, who is the wife of a reigning king, or a queen regent, who is the guardian of a child monarch reigning temporarily in their stead. An empress regnant is a female monarch who reigns in her own right over an empire.

A queen regnant possesses and exercises sovereign powers. A queen consort shares her husband's rank and titles, but does not share the sovereignty of her husband. The husband of a queen regnant traditionally does not share his wife's rank, title or sovereignty. However, the concept of a king consort is not unheard of in contemporary or classical periods.

A queen dowager is the widow of a king. A queen mother is a queen dowager who is also the mother of a reigning sovereign.

In Ancient Egypt, Ancient Persia, Asian and Pacific cultures, and even some European countries, as noted below, 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 where gender is needed. 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.

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.

...
Wikipedia