1. Constitutional Pathways to Abolish a Monarchy

A. Parliamentary Abolition (Legislative Supremacy Model)

This occurs where the legislature has sovereign law-making authority and can redefine the head of state.

Key mechanism:

• Parliament passes an Abolition of Monarchy Act
• Replaces monarch with a President or republican head of state
• Often followed by constitutional amendment or replacement constitution

Core idea:

In systems like the UK theory, Parliament is sovereign and can legally transform the state structure.

B. Constituent Assembly Model

Used where constitutional change requires a special body representing “constituent power” of the people.

Steps:

• Election of Constituent Assembly
• Drafting of republican constitution
• Formal abolition of monarchy in new constitutional text

C. Referendum-Based Abolition

Monarchy is abolished through direct democratic approval.

Steps:

• National referendum held
• Majority vote for republic
• Constitutional amendment or new constitution enacted

D. Revolutionary or Extra-Constitutional Abolition

• Monarchy removed through revolution or collapse
• New legal order later legitimised through constitution

2. Key Case Laws and Constitutional Precedents

1. Abolition of Monarchy in France (1792) – National Convention

Although not a judicial case, it is a foundational constitutional precedent.

• The National Convention declared the monarchy abolished and created the First Republic.
• Established the principle that sovereignty resides in the nation, not the crown.

👉 Principle: Legislative body can extinguish monarchy entirely through constituent authority.

2. Madzimbamuto v Lardner-Burke (1969) – UK Judicial Recognition of Constitutional Breakdown

• Privy Council addressed legality of governance after Rhodesia’s Unilateral Declaration of Independence.
• Even when monarchy-based constitutional order is disrupted, courts focus on effective control and legal validity of new order.

👉 Principle: Courts may recognize post-monarchy legal order if effective governance exists.

3. A-G for Cyprus v Mustafa Ibrahim (1964)

• After constitutional breakdown in Cyprus, courts upheld necessity doctrine.
• Judicial recognition of extra-constitutional transition for survival of state institutions.

👉 Principle: Constitutional order (including monarchy-based systems) can be replaced when necessity demands.

4. Miller v Secretary of State for Exiting the EU (2017)

• UK Supreme Court confirmed that constitutional changes affecting fundamental state structure require parliamentary authority.

👉 Principle: Major constitutional transformation (such as ending monarchy) cannot occur by executive action alone.

5. Jackson v Attorney General (2005)

• House of Lords examined limits of parliamentary sovereignty.
• Lord Steyn and others suggested that even Parliament’s powers may be constitutionally constrained in extreme cases.

👉 Principle: Abolition of monarchy would likely require clear constitutional legitimacy and possibly constituent approval, not implied power alone.

6. Thoburn v Sunderland City Council (2002) – “Constitutional Statutes Doctrine”

• Established that some laws are “constitutional statutes” not subject to implied repeal.

👉 Principle: The monarchy, if embedded in constitutional statutes, may require explicit and fundamental legal change to abolish.

7. Reference re Secession of Quebec (1998, Canada)

• Supreme Court of Canada held that constitutional change requires:
  • Democracy
  • Rule of law
  • Federalism
  • Protection of minorities

👉 Principle: Even abolition of monarchy must follow constitutional negotiation and democratic legitimacy, not unilateral action.

8. Barbados Constitutional Transition (2021 Practice-Based Precedent)

• Barbados removed the monarch via constitutional amendment.
• Created a republic while maintaining parliamentary democracy.

👉 Principle: Monarchy can be abolished without regime collapse, through structured constitutional amendment.

3. Step-by-Step Legal Model of Monarchy Abolition

A “standard constitutional pathway” typically includes:

Step 1: Political mandate

• Election or referendum favouring republic

Step 2: Legal proposal

• Constitutional amendment bill introduced

Step 3: Supermajority approval

• Parliament + sometimes upper house approval

Step 4: Constitutional replacement

• Monarch removed as head of state
• President or alternative head introduced

Step 5: Legal continuity clause

• All laws under monarchy remain valid (“continuity doctrine”)

4. Key Constitutional Principles Derived from Case Law

From the above cases, five major principles emerge:

1. Sovereignty Principle

(Miller, France 1792)
→ Ultimate authority lies in the people or Parliament, not the monarch.

2. Legal Continuity Principle

(Cyprus Ibrahim, Rhodesia cases)
→ State must avoid legal vacuum when monarchy is removed.

3. Constitutional Rigidity Principle

(Thoburn)
→ Monarchy cannot be removed by implied repeal; explicit constitutional change required.

4. Democratic Legitimacy Principle

(Quebec Reference)
→ Major constitutional transformation must reflect democratic will.

5. Parliamentary Authority Principle

(Jackson, Miller)
→ Parliament is central but may face constitutional limits in foundational change.

5. Conclusion

The abolition of monarchy is not simply a political decision—it is a constitutional redesign of the state itself. Across jurisdictions, courts and constitutional practice show a consistent pattern:

• Monarchies can be abolished lawfully
• But only through explicit constitutional authority
• Usually requiring parliamentary supermajority, referendum, or constituent assembly
• And always ensuring legal continuity of the state