I am compiling a summary chart of basic Crown succession rules in the major surviving European monarchies. There is, however, some missing and unverified infornation. Please feel free to contribute.
1) United Kingdom and Commonwealth Realms
Eligibility to the throne: legitimate Protestant descendants of Sophia, Electress of Hanover. In addition, the monarch must be in communion with the established (Anglican Episcopal) Church of England.
Order of Succession: equal primogeniture for persons born after October 28, 2011; otherwise, male-preference cognatic primogeniture.
Grounds for exclusion from the line of succession: conversion to the Roman Catholic faith (previously, also marriage to Catholics); entering into marriage without the consent of the monarch declared in Council (note: the latter rule applies only to the first six persons in line to the throne and the exclusion extends to all legitimate descendants of the marriage).
Minimum age to assume the royal prerogative: 18; until then, the royal prerogative is exercised by a regent who must be the next person in the line of succession who is of "full age", is a British national resident in the United Kingdom, and is not disqualified from succeeding to the Crown.
Vacancy of the throne: ?
2) Kingdom of the Netherlands
Eligibility to the throne: legitimate descendants of King Willem I, Prince of Orange-Nassau, who are not removed from the current monarch by more than three degrees of consanguinity (i.e. children, grandchildren, siblings, nephews/nieces, aunts/uncles, and, if any, great-grandchildren of the monarch).
Order of Succession: equal primogeniture.
Grounds for exclusion from the line of succession: entering into marriage without the consent of the Dutch parliament given in the form of a law passed by both houses of parliament in a joint session (note: the exclusion in that case extends to any children born of that marriage and their respective issue). Exceptionally, one or more individual persons may be also excluded from the hereditary succession by Act of Parliament if exceptional circumstances require and such exclusion is approved by two-thirds of the votes cast in a joint session of the two houses of parliament.
Minimum age to assume the royal prerogative: 18 ; until then, the royal prerogative is exercised by a regent appointed by an act of parliament passed in a joint session of the two houses.
Vacancy of the throne: if there is no person qualified to succeed, the current monarch may propose his successor in the form of a bill introduced in parliament. The two houses of parliament are subsequently dissolved and the newly convened houses meet in joint session in order to decide on the bill. The bill is accepted only if at least two-thirds of the votes cast are in favor.
3) Kingdom of Sweden
Eligibility to the throne: currently, only legitimate descendants of King Carl XVI Gustaf. In addition, the monarch must be a member of the (Evangelical Lutheran) Church of Sweden.
Order of Succession: equal primogeniture.
Grounds for exclusion from the line of succession (extending to the excluded person's descendants): entering into marriage without the consent of the Swedish government given upon application by the monarch; becoming the head of state or government of a foreign country without the consent of the monarch and the parliament of Sweden; not being a member of the (Evangelical Lutheran) Church of Sweden; and not being raised in Sweden.
Minimum age to assume the royal prerogative: 18 ; until then, the royal prerogative is exercised by a regent appointed by the parliament of Sweden.
Vacancy of the throne: if the Royal House becomes extinct, the parliament of Sweden elects a regent to perform the duties of Head of State until further notice; parliament is no longer required though to elect a new royal house to replace the former one upon its extinction.
4) Kingdom of Norway
Eligibility to the throne: legitimate descendants of the current monarch; siblings of the current monarch; and legitimate descendants of siblings of the current monarch. In addition, the monarch must profess the Evangelical Lutheran religion.
Order of Succession: agnatic primogeniture for persons born before 1971; male-preference cognatic primogeniture for persons born between 1971 and 1989; equal primogeniture for persons born in or after 1990.
Grounds for exclusion from the line of succession (extending to all descendants): entering into marriage without the consent of the monarch; becoming the head of state or government of a foreign country without the consent of the monarch and two-thirds of the members of the Norwegian parliament.
Minimum age to assume the royal prerogative: 18 (?); if the monarch is under age, the Council of State summons the parliament to make provisions for the government of the kingdom during his/her minority.
Vacancy of the throne: f there is no prince or princess entitled to the succession, the monarch may propose his/her successor to parliament, which has the right to make the choice if the King's proposal is not accepted. If the Royal Line has become extinct and no successor to the throne has been previously designated, then a new Queen or King must be necessarily chosen by parliament . Meanwhile, the royal prerogative is exercised temporarily by the Council of State.
5) Kingdom of Spain
Eligibility to the throne: currently, only legitimate descendants of King Juan Carlos I of Borbon.
Order of Succession: male-preference cognatic primogeniture.
Grounds for exclusion from the line of succession: entering into marriage against the explicit prohibition of the monarch and the Spanish parliament. Voluntary renunciations of succession rights are possible only if ratified by organic law.
Minimum age to assume the royal prerogative: 18 (?) ; until then, the surviving mother or father, or relative of legal age who is nearest in line to the throne immediately assumes the office of Regent. If there is no person who can exercise the regency, a council of regents is appointed by the parliament consisting of one, three, or five persons.
Vacancy of the throne: if there are no legally qualified persons to ascend the throne, the parliament shall provide for the succession to the Crown in a manner which, according to the constitution, must be "the best for the interests of Spain".
6) Kingdom of Denmark
Eligibility to the throne: legitimate descendants of King Christian X and Queen Alexandrine. In addition, the monarch must belong to the established (Evangelical Lutheran) Church of Denmark.
Order of Succession: male-preference cognatic primogeniture for persons born before June 2009 (?); equal primogeniture for persons born after June 2009.
Grounds for exclusion from the line of succession: entering into marriage without the consent of the monarch expressed in a Council of State; when consenting to the marriage, , the monarch can impose conditions that must be met in order for any resulting offspring to have succession rights (e.g. being raised in Denmark).
Minimum age to assume the royal prerogative: 18; provisions relating to the exercising of sovereign power in the event of the minority of the King shall be laid down by Statute.
Vacancy of the throne: if, on the vacancy of the throne, there is no qualified successor, the parliament of Denmark shall elect a monarch and establish the future order of succession to the throne.
7) Kingdom of Belgium
Eligibility to the throne: legitimate descendants of King Leopold I of Saxe-Coburg and Gotha.
Order of Succession: equal primogeniture for descendants of King Albert II; otherwise, agnatic primogeniture.
Grounds for exclusion from the line of succession: entering into marriage without the consent of the monarch expressed by royal decree (hence, with ministerial countersignature). The exclusion may be reversed though by the monarch with the approval of the two houses of the federal parliament.
Minimum age to assume the royal prerogative: 18 ; until then, the royal prerogative is exercised by a regent appointed by the federal parliament in a joint session of the two houses.
Vacancy of the throne: if there is no person available to succeed, the monarch may name his/her successor with the approval of both houses of the federal parliament, which can only adopt a resolution to that effect if two-thirds of their members are present and upon a two-third majority vote. If the throne is vacant, the two houses meet in joint session to provide for a temporary regency; following an election, the two newly convened houses meet again in a joint session to provide permanent cover for the vacancy.
1) United Kingdom and Commonwealth Realms
Eligibility to the throne: legitimate Protestant descendants of Sophia, Electress of Hanover. In addition, the monarch must be in communion with the established (Anglican Episcopal) Church of England.
Order of Succession: equal primogeniture for persons born after October 28, 2011; otherwise, male-preference cognatic primogeniture.
Grounds for exclusion from the line of succession: conversion to the Roman Catholic faith (previously, also marriage to Catholics); entering into marriage without the consent of the monarch declared in Council (note: the latter rule applies only to the first six persons in line to the throne and the exclusion extends to all legitimate descendants of the marriage).
Minimum age to assume the royal prerogative: 18; until then, the royal prerogative is exercised by a regent who must be the next person in the line of succession who is of "full age", is a British national resident in the United Kingdom, and is not disqualified from succeeding to the Crown.
Vacancy of the throne: ?
2) Kingdom of the Netherlands
Eligibility to the throne: legitimate descendants of King Willem I, Prince of Orange-Nassau, who are not removed from the current monarch by more than three degrees of consanguinity (i.e. children, grandchildren, siblings, nephews/nieces, aunts/uncles, and, if any, great-grandchildren of the monarch).
Order of Succession: equal primogeniture.
Grounds for exclusion from the line of succession: entering into marriage without the consent of the Dutch parliament given in the form of a law passed by both houses of parliament in a joint session (note: the exclusion in that case extends to any children born of that marriage and their respective issue). Exceptionally, one or more individual persons may be also excluded from the hereditary succession by Act of Parliament if exceptional circumstances require and such exclusion is approved by two-thirds of the votes cast in a joint session of the two houses of parliament.
Minimum age to assume the royal prerogative: 18 ; until then, the royal prerogative is exercised by a regent appointed by an act of parliament passed in a joint session of the two houses.
Vacancy of the throne: if there is no person qualified to succeed, the current monarch may propose his successor in the form of a bill introduced in parliament. The two houses of parliament are subsequently dissolved and the newly convened houses meet in joint session in order to decide on the bill. The bill is accepted only if at least two-thirds of the votes cast are in favor.
3) Kingdom of Sweden
Eligibility to the throne: currently, only legitimate descendants of King Carl XVI Gustaf. In addition, the monarch must be a member of the (Evangelical Lutheran) Church of Sweden.
Order of Succession: equal primogeniture.
Grounds for exclusion from the line of succession (extending to the excluded person's descendants): entering into marriage without the consent of the Swedish government given upon application by the monarch; becoming the head of state or government of a foreign country without the consent of the monarch and the parliament of Sweden; not being a member of the (Evangelical Lutheran) Church of Sweden; and not being raised in Sweden.
Minimum age to assume the royal prerogative: 18 ; until then, the royal prerogative is exercised by a regent appointed by the parliament of Sweden.
Vacancy of the throne: if the Royal House becomes extinct, the parliament of Sweden elects a regent to perform the duties of Head of State until further notice; parliament is no longer required though to elect a new royal house to replace the former one upon its extinction.
4) Kingdom of Norway
Eligibility to the throne: legitimate descendants of the current monarch; siblings of the current monarch; and legitimate descendants of siblings of the current monarch. In addition, the monarch must profess the Evangelical Lutheran religion.
Order of Succession: agnatic primogeniture for persons born before 1971; male-preference cognatic primogeniture for persons born between 1971 and 1989; equal primogeniture for persons born in or after 1990.
Grounds for exclusion from the line of succession (extending to all descendants): entering into marriage without the consent of the monarch; becoming the head of state or government of a foreign country without the consent of the monarch and two-thirds of the members of the Norwegian parliament.
Minimum age to assume the royal prerogative: 18 (?); if the monarch is under age, the Council of State summons the parliament to make provisions for the government of the kingdom during his/her minority.
Vacancy of the throne: f there is no prince or princess entitled to the succession, the monarch may propose his/her successor to parliament, which has the right to make the choice if the King's proposal is not accepted. If the Royal Line has become extinct and no successor to the throne has been previously designated, then a new Queen or King must be necessarily chosen by parliament . Meanwhile, the royal prerogative is exercised temporarily by the Council of State.
5) Kingdom of Spain
Eligibility to the throne: currently, only legitimate descendants of King Juan Carlos I of Borbon.
Order of Succession: male-preference cognatic primogeniture.
Grounds for exclusion from the line of succession: entering into marriage against the explicit prohibition of the monarch and the Spanish parliament. Voluntary renunciations of succession rights are possible only if ratified by organic law.
Minimum age to assume the royal prerogative: 18 (?) ; until then, the surviving mother or father, or relative of legal age who is nearest in line to the throne immediately assumes the office of Regent. If there is no person who can exercise the regency, a council of regents is appointed by the parliament consisting of one, three, or five persons.
Vacancy of the throne: if there are no legally qualified persons to ascend the throne, the parliament shall provide for the succession to the Crown in a manner which, according to the constitution, must be "the best for the interests of Spain".
6) Kingdom of Denmark
Eligibility to the throne: legitimate descendants of King Christian X and Queen Alexandrine. In addition, the monarch must belong to the established (Evangelical Lutheran) Church of Denmark.
Order of Succession: male-preference cognatic primogeniture for persons born before June 2009 (?); equal primogeniture for persons born after June 2009.
Grounds for exclusion from the line of succession: entering into marriage without the consent of the monarch expressed in a Council of State; when consenting to the marriage, , the monarch can impose conditions that must be met in order for any resulting offspring to have succession rights (e.g. being raised in Denmark).
Minimum age to assume the royal prerogative: 18; provisions relating to the exercising of sovereign power in the event of the minority of the King shall be laid down by Statute.
Vacancy of the throne: if, on the vacancy of the throne, there is no qualified successor, the parliament of Denmark shall elect a monarch and establish the future order of succession to the throne.
7) Kingdom of Belgium
Eligibility to the throne: legitimate descendants of King Leopold I of Saxe-Coburg and Gotha.
Order of Succession: equal primogeniture for descendants of King Albert II; otherwise, agnatic primogeniture.
Grounds for exclusion from the line of succession: entering into marriage without the consent of the monarch expressed by royal decree (hence, with ministerial countersignature). The exclusion may be reversed though by the monarch with the approval of the two houses of the federal parliament.
Minimum age to assume the royal prerogative: 18 ; until then, the royal prerogative is exercised by a regent appointed by the federal parliament in a joint session of the two houses.
Vacancy of the throne: if there is no person available to succeed, the monarch may name his/her successor with the approval of both houses of the federal parliament, which can only adopt a resolution to that effect if two-thirds of their members are present and upon a two-third majority vote. If the throne is vacant, the two houses meet in joint session to provide for a temporary regency; following an election, the two newly convened houses meet again in a joint session to provide permanent cover for the vacancy.
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