Calvin's Case (The Case of the Postnati) [1608]

(1608) 7 Co. Rep. 1a, 77 E.R. 377 · Court of King's Bench, Exchequer Chamber, and House of Lords · England and Wales

Legal Historylegal-historycitizenshipsubjectioncommon-lawconstitutional-law

Issue

Whether a person born in Scotland after the accession of James I to the English throne (a 'postnatus') is an alien or a natural-born subject in England, and therefore capable of bringing an action for land in England.

Held

Calvin was a natural-born subject of the King of England and thus could inherit land in England. The doctrine of allegiance is based on the person of the sovereign, not on the territory or the kingdom.

Exam use

Use Calvin's Case for questions on citizenship, nationality, or the nature of allegiance. It is the classic authority for the common law definition of a natural-born subject: not based on where you are born, but under whose allegiance you are born (though modern UK law is now statute-based). The case is also excellent for discussing the use of natural law arguments in the common law. The distinction between postnatus and antinatus is key. In a problem question involving dual citizenship or the effect of territorial change, Calvin's Case provides the historical framework of perpetual allegiance.

Summary

Calvin's Case (1608) was a landmark case in English legal history concerning the legal status of persons born in Scotland after the accession of King James I to the English throne (the Union of the Crowns, 1603). The issue was whether a 'postnatus' (a person born in Scotland after James's accession) could inherit land in England. The court, with Coke CJ playing a leading role, held that allegiance is owed to the sovereign, not the territory, and that postnati were natural-born subjects in England and could inherit land.

Facts

Robert Calvin (born 1605) was a Scottish infant born in Edinburgh after the accession of King James I to the English throne in 1603. He brought an action in the English Court of King's Bench to recover possession of certain lands in England held by his family. The defendant Richard Nichols denied Calvin's title, arguing that Calvin, being born in Scotland, was an alien and thus incapable of holding English land. The case was considered of the utmost importance for the Union of the Crowns, and all of the senior judges of England were summoned to hear it.

Procedural History

The case was argued at length before all the judges of England in the Exchequer Chamber, and later the House of Lords. All 14 judges agreed on the result. The case was then reported by Chief Justice Coke in an extensive opinion.

Issue

Whether a person born in Scotland after the accession of James I to the English throne (a 'postnatus') is an alien or a natural-born subject in England, and therefore capable of bringing an action for land in England.

Held

Calvin was a natural-born subject of the King of England and thus could inherit land in England. The doctrine of allegiance is based on the person of the sovereign, not on the territory or the kingdom.

Ratio Decidendi

Allegiance is due to the sovereign as a matter of natural law (ligentia naturalis) from the moment of birth, and is perpetual and universal. Subjects owe allegiance to the King, not to the kingdom or its laws. Since the King of England and the King of Scotland were the same person, Calvin, born in Scotland under that King's allegiance, owed the same allegiance and was entitled to the same rights as a person born in England. The distinction between 'antinati' (born before the union) and 'postnati' (born after) was crucial: only postnati were members of the same allegiance.

Obiter Dicta

Coke's extensive discussion of the nature of allegiance, the power of the King over subjects, and the distinction between the natural law and positive law was highly influential. The case also discussed the status of the King as a body politic and natural, and the perpetuity of allegiance.

Reasoning

Coke CJ, after extensive review of civil law (Justinian's Code), common law authorities, and feudal law, reasoned that allegiance is founded on the natural law: every person born within the King's power owes allegiance. The King has two capacities: a natural body (the physical person) and a body politic (the office). Since both England and Scotland shared the same natural sovereign, those born under his rule (postnati) were subject to the same allegiance. The Court rejected the argument that allegiance was territorial or to the law itself. The union of the crowns made the King one person, so postnati were equally subjects. The case thus resolved a politically fraught situation by using legal reasoning to grant Scots born after 1603 the same land rights in England as English-born subjects.

Plain-English Explanation

When King James I became king of both England and Scotland, a big legal question arose: could a person born in Scotland after 1603 inherit land in England? The court said yes. The reason is that allegiance is to the person of the King, not to the country or its laws. Since the King was the same person for both kingdoms, a Scot born after the union was as much a subject of the King as an English person. This is the origin of the idea of a 'natural-born subject' in English law.

Essay-Ready Explanation Generator

Version 1 of 4

Reference to Calvin's Case (The Case of the Postnati) ((1608) 7 Co. Rep. 1a, 77 E.R. 377) strengthens a Legal History answer because the case reflects the principle that Allegiance is due to the sovereign as a matter of natural law (ligentia naturalis) from the moment of birth, and is perpetual and universal. Subjects owe allegiance to the King, not to the kingdom or its laws. Since the King of England and the King of Scotland were the same person, Calvin, born in Scotland under that King's allegiance, owed the same allegiance and was entitled to the same rights as a person born in England. The distinction between 'antinati' (born before the union) and 'postnati' (born after) was crucial: only postnati were members of the same allegiance. Applied to a problem question, the case should be used after identifying the issue as Whether a person born in Scotland after the accession of James I to the English throne (a 'postnatus') is an alien or a natural-born subject in England, and therefore capable of bringing an action for land in England. The stronger essay move is to connect the material facts to the court's holding, then explain whether the present facts support the same conclusion or justify distinguishing the authority.

Underlying Concepts

  • Allegiance (ligentia naturalis)
  • Natural law
  • Body politic and natural body
  • Subjection
  • Citizenship
  • Union of the Crowns

Precedents Applied

  • Justinian's Corpus Juris Civilis
  • Bracton
  • Fortescue, De Laudibus Legum Angliae

Later Treatment

  • Bacon v. Burgess (1846) 5 Hare 247
  • Attorney-General v. Prince Ernest Augustus of Hanover [1957] AC 436

Key Passages

  • ...allegiance is the bond of the law whereby the subject is bound to his prince, according to the law of nature.
  • The King hath two capacities: one natural, as a man; and another politic, as a body incorporate, being a King.

Significance

Calvin's Case is a foundation stone of British nationality law and the common law of citizenship. It established the principle that allegiance is personal to the monarch, which was the basis for the old 'common law' definition of a subject. The case also developed the concepts of 'natural-born subject' and the 'body politic' as distinct from the natural person of the King. It is crucial for understanding the development of the modern law of citizenship and the common law's response to the personal union of crowns. In legal history, the case is a masterpiece of early modern legal reasoning, combining natural law, civil law, and common law sources. It was relied upon for centuries in questions of nationality, including in colonial contexts. The case also illustrates how the common law adapted to the constitutional reality of the Union of the Crowns before the Union of the Parliaments in 1707.

Related Cases

Exam Tips

Use Calvin's Case for questions on citizenship, nationality, or the nature of allegiance. It is the classic authority for the common law definition of a natural-born subject: not based on where you are born, but under whose allegiance you are born (though modern UK law is now statute-based). The case is also excellent for discussing the use of natural law arguments in the common law. The distinction between postnatus and antinatus is key. In a problem question involving dual citizenship or the effect of territorial change, Calvin's Case provides the historical framework of perpetual allegiance.

Revision Checklist

  • Name the issue before discussing facts so the marker sees the legal question immediately.
  • State the holding in one sentence, then use the ratio to explain why the court reached that result.
  • Use the citation and jurisdiction to show why this authority matters for the problem you are answering.
  • Pair this case with one supporting or contrasting authority if the question tests limits, policy, or exceptions.

Problem Question Use

In a problem question about nationality, if the issue involves a person's status after a change of sovereignty or union, use Calvin's Case to argue that continued allegiance to the sovereign preserves subject status. If a question involves the status of a foreign-born child of a British subject, this case provides the historical common law rule. For questions about the limits of Crown authority, the case's discussion of the King's two bodies is very useful.

Common Pitfalls

  • Thinking Calvin's Case established the modern jus soli rule of birthright citizenship (it is about allegiance to the sovereign, not territory)
  • Confusing the Union of the Crowns (1603) with the Union of the Parliaments (1707), which changed the legal framework
  • Neglecting the distinction between postnati and antinati, which was essential to the decision

Sources