Definition
The disseisitus is the person who has been disseised — that is, the party wrongfully dispossessed of a freehold estate. The term identifies the victim in an act of disseisin: the one who held seisin (possession of freehold land recognized by feudal law) and was then put out of that possession by another, the disseisor. The disseisitus stands in contrast to the disseisor, who wrongfully takes or withholds possession. In the common law real property system, the disseisitus retained the right to recover the land through appropriate real actions, most notably the writ of novel disseisin, and later through the action of ejectment as procedural forms evolved.
Common Confusion
DISSEISITUS vs. DISSEISOR: These terms are mirror images and are sometimes confused in older legal texts, particularly where Latin declensions are rendered inconsistently. The disseisitus is the injured party — the one dispossessed. The disseisor is the wrongdoer — the one who seized possession. In records involving real actions, identifying which party is which is essential to understanding the procedural posture of the case.
DISSEISITUS vs. DISSEISEE: These are the same party. Disseisee is the anglicized equivalent of the Latin disseisitus. Bouvier treats them as interchangeable. Older abridgments and Year Books may use either form; later English and American sources tend to prefer the anglicized disseisee. When searching historical records, both forms should be queried.
Why It Matters in Research
This term belongs to the technical vocabulary of medieval and early modern English real property law and will appear primarily in sources predating the abolition of the real property forms of action in England (Real Property Limitation Act 1833 and the Common Law Procedure Act 1852) and in American jurisdictions that retained real actions into the nineteenth century. A researcher encountering disseisitus in a legal record is likely working with materials from the period when seisin — not mere possession — was the operative concept in land law, and when specific writs governed recovery of freehold land.
Key research traps: First, disseisitus is a term of feudal tenure theory. It presupposes a freehold and seisin; it does not apply to leaseholders or to personal property. Finding the term in a document helps date and frame the legal context — its presence signals a real property dispute within the common law writ system. Second, the concept of disseisin itself shifted over time. In early law, disseisin required an ouster — an actual, forcible or wrongful dispossession. Later courts expanded the concept to include constructive disseisin, broadening who could qualify as a disseisitus. Reading period-specific commentary is essential to understanding what the term means in a given document. Third, American jurisdictions varied in how long they preserved real actions. Some states retained forms of the writ system well past the English reforms; others moved quickly to ejectment as the universal remedy. The term may therefore persist in American records later than its English counterparts.
The disseisitus concept also connects directly to adverse possession doctrine: the disseisitus's failure to bring a timely action could eventually extinguish the right to recover, vesting title in the disseisor by operation of limitations law. Understanding the relationship between disseisin and limitations periods is critical for historical title research.
Historical Dictionary Support
Bouvier's Law Dictionary defines disseisitus simply as "a disseisor, or the party who is disseised, or put out of possession or seisin of the freehold," citing Burrill's Law Dictionary and Littleton's Tenures at section 472. The Burrill cross-reference is worth noting: Burrill's Law Dictionary (1839) predates Bouvier's and likewise treats the term in the context of feudal seisin. Littleton's Tenures, the foundational fifteenth-century treatise on English land law, is the authoritative primary source for seisin doctrine generally, and Bouvier's citation to section 472 points researchers to Littleton's treatment of disseisin and the rights that flow from it.
Neither Bouvier nor Burrill develops the procedural consequences at length under this entry — those are treated more fully under DISSEISIN and NOVEL DISSEISIN. The entry for disseisitus functions as a cross-reference anchor rather than a substantive treatment. Researchers should not expect the standalone entry to capture the full doctrine; they must follow the trail to disseisin and the real actions.
No significant divergence appears among historical dictionary sources on the core meaning. The term is technically narrow and its meaning was stable: it designated the dispossessed freeholder, nothing more and nothing less.