Definition
An obsolete writ of entry in English common law, available to an heir seeking to recover lands from which he had been dispossessed by abatement following the death of his great-great-grandfather (the grandfather's grandfather). The writ was one of a series of ancestral writs designed to address wrongful possession arising at the death of a specific ancestor, with the identity of that ancestor determining which writ applied. Tresayle addressed the furthest generational reach in this series. Like its kin writs, it has been entirely abolished and has no modern procedural equivalent.
Common Language
Modern common usage (Wiktionary): A grandfather's grandfather; a great-great-grandfather.
Historical common usage (Webster's 1913): "A grandfather's grandfather." Webster's notes the writ separately, describing it as lying for a man claiming as heir to his grandfather's grandfather to recover lands lost by abatement on the ancestor's death.
The common meaning of tresayle is simply the relational term for a great-great-grandfather. The legal meaning is the writ itself — the procedural remedy available to an heir of such an ancestor. A researcher encountering the word in a legal source must determine whether it refers to the person or the action; in legal instruments and pleading records, it almost always refers to the writ.
Common Confusion
Tresayle is the furthest-reaching member of a family of ancestral writs that are routinely conflated. The series runs: Mort d'ancestor (death of father, mother, brother, sister, uncle, or aunt); Aiel (grandfather); Besaiel (grandmother or grandfather's father); Cosinage or Cosinage (more remote collateral ancestors); and Tresayle (grandfather's grandfather). Each writ was strictly limited to its designated ancestor, and pleading the wrong writ was fatal to the action. Researchers working with medieval plea rolls should not assume these terms are interchangeable. See also BESAIEL and AIEL.
Why It Matters in Research
Tresayle appears almost exclusively in sources predating the English real property reforms of the nineteenth century, particularly those addressing the writs of entry and ancestral actions that were swept away by the Real Property Limitation Act 1833 and definitively abolished by the Common Law Procedure Act 1860. Researchers will encounter the term in three contexts: (1) medieval and early modern plea rolls and year books, where it appears as an active procedural device; (2) treatises on the forms of action, particularly those cataloguing the ancestral writs as a system; and (3) nineteenth-century legal dictionaries and institutional writers summarizing abolished remedies.
The primary research trap is generational miscounting. Because tresayle required the claimant to trace title through four generations to a specific ancestor, errors in genealogical reckoning could defeat the writ entirely — and a court would not simply redirect the plaintiff to a lesser writ. If the ancestor was the grandfather rather than the great-great-grandfather, tresayle was the wrong action. This precision matters when reading historical pleadings: the choice of writ is itself evidence of the claimant's genealogical theory of title.
The term also illustrates the broader problem of ancestral writs as a research category: by the time most legal dictionaries were compiled, these writs had been abolished for decades, and dictionary definitions (including all three sources here) offer only the barest description. Researchers needing substantive detail must go to the institutional writers — Bracton, Fitzherbert's Natura Brevium, or Blackstone's Commentaries — rather than relying on dictionary entries, which function as identification markers rather than practical guides.
Historical Dictionary Support
All three source dictionaries — Black's (1st ed.), Black's (2nd ed.), and Rapalje & Lawrence — give identical one-sentence definitions, describing tresayle as an abolished writ sued on ouster by abatement on the death of the grandfather's grandfather. There is no divergence among them, which itself signals that by the time these dictionaries were compiled, tresayle was purely historical. None of the three sources explains the writ's mechanics, its relationship to the other ancestral writs, or the procedural consequences of misidentifying the correct ancestor. Webster's 1913, though not a legal authority, is marginally more informative in noting that the writ lay for recovery of lands lost by abatement — language that at least identifies the nature of the possessory wrong the writ addressed. The historical dictionaries are adequate for identification purposes only. Substantive understanding requires recourse to primary institutional sources.
Jurisdictional Note
Tresayle was a writ of English common law and was never adopted in American jurisdictions as a live procedural device. American courts and treatises refer to it only in historical or comparative discussions of the forms of action. It has no American statutory history.