Suo jure in the context of "Emperor"

A queen regnant (pl.: queens regnant) is a female monarch, equivalent in rank, title and position to a king. She reigns suo jure (in her own right) over a realm known as a kingdom; as opposed to a queen consort, who is married to a reigning king; or a queen regent, who is the guardian of a child monarch and rules pro tempore in the child's stead or instead of her husband who is absent from the realm, be it de jure in sharing power or de facto in ruling alone. A queen regnant is sometimes called a woman king. A princess, duchess, or grand duchess regnant is a female monarch who reigns suo jure over a principality or (grand) duchy; an empress regnant is a female monarch who reigns suo jure over an empire.

A queen regnant possesses all the powers, such as they may be, of the monarchy, whereas a queen consort or queen regent shares her spouse's 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 and usually holds a lower princely title. However, the concept of a king consort is not unheard of in both contemporary and historical periods.

Jure uxoris (a Latin phrase meaning "by right of (his) wife") describes a title of nobility used by a man because his wife holds the office or title suo jure ("in her own right"). Similarly, the husband of an heiress could become the legal possessor of her lands. For example, married women in England and Wales were legally prohibited from owning real estate until the Married Women's Property Act 1882.

A viceroy (/ˈvaɪsrɔɪ/) is an official who reigns over a polity in the name of and as the representative of the monarch of the territory.

The term derives from the Latin prefix vice-, meaning "in the place of" and the Anglo-Norman roy (Old French roi, roy), meaning "king". This denotes the position as one who acts on behalf of a king or monarch. A viceroy's territory may be called a viceroyalty, though this term is not always applied. The adjective form is viceregal, less often viceroyal. The term vicereine is sometimes used to indicate a female viceroy suo jure, although viceroy can serve as a gender-neutral term. Vicereine is more commonly used to indicate a viceroy's wife, known as the viceregal consort.

Louise of Savoy (11 September 1476 – 22 September 1531) was a French noble and regent, Duchess suo jure of Auvergne and Bourbon, Duchess of Nemours and the mother of King Francis I and Marguerite of Navarre. She was politically active and served as the regent of France in 1515, in 1525–1526 and in 1529, during the absence of her son.

A queen consort is the wife of a reigning king, and usually shares her spouse's social rank and status. She holds the feminine equivalent of the king's monarchical titles and may be crowned and anointed, but historically she does not formally share the king's political and military powers, unless on occasion acting as regent.

In contrast, a queen regnant is a female monarch who rules suo jure (Latin for, "in her own right") and usually becomes queen by inheriting the throne upon the death of the previous monarch.