Knight v Knight [1840]

Knight v Knight [1840] 49 ER 58 is a landmark English trusts law case that establishes the principle of three certainties. This principle serves as a crucial criterion for determining the validity of trusts and plays a significant role in the disposition of assets through wills. The case has had a lasting impact and has been followed in numerous common law jurisdictions.

Richard I Knight, a wealthy ironmaster, made a settlement in 1729, passing the manors of Leintwardine and Downton, Herefordshire, down the family line. His grandson, Payne Knight, an art connoisseur, made a will in 1814, leaving the property to his brother, Thomas Andrew Knight, and in tail male to his male descendants. The will also expressed a trust in the liberality and justice of his successors. Thomas Knight died intestate, and a claim was brought by John Knight, alleging that a strict settlement in favour of the male line was binding.

Lord Langdale MR delivered the judgment, holding that Payne's will lacked the necessary certainty, resulting in an absolute gift to Thomas. This judgment led to the formulation of the test for three certainties, a fundamental aspect of trusts law. The three certainties required for a valid trust are:
  1. Certainty of intention: There must be a clear intention to create a trust.
  2. Certainty of subject matter: The assets constituting the trust must be readily determinable.
  3. Certainty of objects: The individuals to whom the trustees owe a duty must be readily determinable.

This case is renowned for articulating the three certainties that must be present for a trust to be valid. This test ensures clarity in the creation and execution of trusts. The case laid down a clear standard for evaluating the validity of trusts, particularly those established through wills. Ambiguities in any of the certainties may render the trust invalid. The principle of three certainties has become a cornerstone in trusts law, guiding legal practitioners, scholars, and courts in assessing the effectiveness of trust instruments.

In summary, this case is a pivotal case that has significantly shaped the legal landscape of trusts, providing a structured framework to ascertain the validity of trusts based on the certainties of intention, subject matter, and objects.
Back to blog
UOLLB SQE Turbocharge

UOLLB SQE Turbocharge

Get ready for the SQE1 with high-performance SQE Study Guides developed by UOLLB, edited by lawyers, and published by UOL Press to revolutionise your study method and exam strategy.

Turbocharge SQE Performance

UOL Case Bank

Upon joining, you become a valuable UOL student and gain instant access to over 2,100 essential case summaries. UOL Case Bank is constantly expanding.
Speed up your revision with us now👇

Subscribe Now

Where are our students from?

Council of Europe
Crown Prosecution Service
Baker Mckenzie 
Yale University
University of Chicago
Columbia University
New York University
University of Michigan 
INSEAD
University of London
University College London (UCL)
London School of Economics (LSE)
King’s College London (KCL)
Royal Holloway, University of London 
Birkbeck, University of London
SOAS, University of London
University of Manchester
University of Zurich
University of York
Brandeis University
University of Exeter
University of Sheffield
Boston University
University of Washington
University of Leeds
University of Law
University of Kent
University of Hull
Queen’s University Belfast
Toronto Metropolitan University
Hong Kong University of Science and Technology
University of Buckingham
ESSEC Business School

  • Criminal Practice

    Diagrams and Charts

    Our carefully designed diagrams and charts will guide you through complex legal issues.

  • Criminal Law

    Clear and Succinct Definitions

    Key concepts are concisely defined to help you understand legal topics quickly.

  • Property Law

    Statutory Provisions

    Statutory provisions are provided side by side with legal concepts to help you swiftly locate the relevant legislation.

  • Public Law

    Case Summaries

    We have summarised important cases for you so that you don't need to read long and boring cases.

  • Evidence

    Rules and Exceptions

    Rules and exceptions are clearly listed so that you know when a rule applies and when it doesn't.

  • Company Law

    Terminology

    Legal terms and key concepts are explained at the beginning of each chapter to help you learn efficiently.

  • Case Law

    Case law is provided side by side with legal concepts so that you know how legal principles and precedents were established.

  • Law Exam Guide

    Law Essay Guide

    You will learn essential law exam skills and essay writing techniques that are not taught in class.

  • Law Exam Guide

    Problem Question Guide

    We will show you how to answer problem questions step by step to achieve first-class results.

  • Conflict of Laws

    Structured Explanations

    Complex legal concepts are broken down into concise and digestible bullet point explanations.

  • Legal System and Method

    Legal Research

    You will learn legal research techniques with our study guide and become a proficient legal researcher.

  • Jurisprudence and Legal Theory

    Exam-focused

    All essential concepts, principles, and case law are included so that you can answer exam questions quickly.