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. She is sometimes called a woman king. 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".
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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 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.