There are two ways a princess becomes a queen: she inherits the throne in her own right, or she marries a king. The first makes her a Queen Regnant, a sovereign with full governing authority. The second makes her a Queen Consort, which carries royal status but no power to govern. Which route is even possible for her depends on the succession laws of her country, and those laws differ sharply from one monarchy to another.
The Two Paths Are Not Equal
A Queen Regnant holds the same rank and powers as a king. She is the head of state. She commands the military, signs legislation, and performs the constitutional functions of the sovereign. Queen Elizabeth II, who reigned over the United Kingdom and the Commonwealth realms from 1952 to 2022, is the modern example most people know.
A Queen Consort is the wife of a reigning king. She holds royal rank and may be crowned at a coronation, but she has no political or military authority and no formal constitutional role. Her title reflects her relationship to the king. Camilla became Queen Consort in September 2022 when Charles III acceded following the death of Elizabeth II.
The titles sound similar, which is why the difference trips people up. A Queen Regnant can dissolve parliament and appoint prime ministers. A Queen Consort attends state banquets. Same word, different job.
Whether Succession Law Lets Her Inherit
A princess reaches the throne by being next in the line of succession when the reigning monarch dies or abdicates. The reigning monarch does not choose a successor. A legal order of inheritance decides who is next, and the transition happens automatically the moment the previous reign ends.1The Royal Family. Succession
Whether a princess can inherit at all depends on which of three succession systems her monarchy uses.
Male-Only Succession
Several monarchies still bar women from the throne entirely. Japan’s 1947 Imperial House Law limits succession to males in the male line, which currently prevents Emperor Naruhito’s only child, Princess Aiko, from inheriting the Chrysanthemum Throne. Similar male-only rules apply in Jordan, Liechtenstein, Morocco, and Brunei, among others. In these systems a princess cannot become Queen Regnant under current law, regardless of her birth order.
Male-Preference Primogeniture
Under male-preference primogeniture, daughters can inherit, but only when there are no eligible sons or male-line descendants. A younger brother leapfrogs an older sister. Spain and Monaco still use this model. It was the dominant European system for centuries, which is why female monarchs were historically rare: a princess needed to have no brothers, and no nephews through those brothers, before she reached the front of the line.1The Royal Family. Succession
Absolute Primogeniture
Under absolute primogeniture, the eldest child inherits regardless of sex. A firstborn daughter outranks a younger brother. Sweden adopted this system first, in 1980, followed by the Netherlands in 1983, Norway in 1990, Belgium in 1991, Denmark in 2009, and Luxembourg in 2011. The United Kingdom passed the Succession to the Crown Act in 2013, ending male-preference primogeniture for the British throne and the other Commonwealth realms; the change formally took effect on March 26, 2015.2Legislation.gov.uk. Succession to the Crown Act 20133Legislation.gov.uk. The Succession to the Crown Act 2013 (Commencement) Order 2015
Heir Apparent Versus Heir Presumptive
Where a princess sits in the line matters. An heir apparent has an unshakable claim: barring abdication or disqualification, no future event can push her out of first position. In monarchies with absolute primogeniture, the eldest child of the sovereign is heir apparent from birth.
An heir presumptive is currently first in line but could be displaced. Under male-preference systems, an eldest daughter is heir presumptive rather than heir apparent, because a brother born later would push her down. Elizabeth (later Queen Elizabeth II) was heir presumptive to George VI from 1936 onward, since a son could still have been born who would have displaced her. The distinction affects how seriously the heir is groomed and how stable the line looks from outside.
Becoming Queen Through Marriage
The other route is marriage. A woman can become Queen Consort either by marrying a man who is already king, or, more commonly, by marrying an heir and becoming Queen Consort when her husband later accedes. She does not need to have been born a princess. Commoners have married into royal families throughout history and taken the title of Queen Consort when their husbands took the throne.
What Happens When the Previous Monarch Dies
Accession is automatic. The new sovereign’s reign begins at the instant the predecessor’s reign ends. No ceremony is required, and no document has to be signed. The transfer of authority happens by operation of law.4The Royal Family. Accession In the British system this is captured in the phrase “the king is dead, long live the king” — there is no gap between reigns.5House of Commons Library. The Death of a Monarch
Public announcement follows through an Accession Council at St James’s Palace, where members of the Privy Council formally proclaim the new monarch.6The Royal Family. The Accession Council and Principal Proclamation The coronation, the grand ceremony most people picture, comes later and is legally unnecessary. The sovereign’s powers do not depend on being crowned, and historically there have been gaps of months or even years between accession and coronation.7House of Commons Library. The Coronation: History and Ceremonial The proclamation and coronation announce authority that already exists; they do not create it.
If the New Queen Is a Child
Succession laws set no minimum age. A princess who is next in line becomes queen even if she is an infant. Because a young child cannot govern, the United Kingdom’s Regency Act 1937 automatically installs a regent whenever the sovereign is under eighteen.8Legislation.gov.uk. Regency Act 1937 The regent is the next person in line after the child sovereign, provided that person is a British subject of full age domiciled in the United Kingdom. The regent exercises royal functions in the sovereign’s name until the young queen turns eighteen, at which point she assumes full personal authority.
Ways a Princess Can Lose Her Place
A princess’s path to the throne can be interrupted. In several monarchies, marrying without the sovereign’s consent, or marrying outside approved religious or social boundaries, can result in removal from the line of succession. Japan’s Imperial House Law goes further: a princess who marries a commoner loses her royal status entirely, as happened with Princess Mako in 2021 and Princess Sayako in 2005.
Abdication is another route out. A reigning queen can step down, though this is extraordinarily rare. Members of the royal family who are far from the throne often simply live private lives without formally renouncing anything. Rules for voluntary renunciation vary between monarchies, and in the British system there is no general statutory mechanism for a person in line to remove themselves from the succession short of specific parliamentary action.