Definition
Odio et atia (Latin: "hatred and malice") is an abbreviated reference to the writ de odio et atia, a medieval English writ directed to the sheriff commanding an inquiry into whether a person imprisoned on suspicion of murder had been committed on lawful grounds or merely out of hatred and ill will toward the accused. If the inquest found no sufficient cause, a second writ issued requiring the sheriff to admit the prisoner to bail. The writ functioned as an early procedural safeguard against pretextual imprisonment, predating and conceptually anticipating later habeas corpus practice.
The term is rarely encountered in isolation. Researchers will almost always find it in the compound form DE ODIO ET ATIA, which is the operative writ designation.
Common Confusion
Odio et atia is sometimes loosely treated as synonymous with habeas corpus, but the two are procedurally distinct. Habeas corpus commands that the prisoner be brought before a court to test the legality of detention. De odio et atia instead sent an inquiry to the sheriff in the field — a local inquest — to determine the character of the accusation itself. It did not produce the body of the prisoner before a judge. The writ of de odio et atia was largely supplanted by habeas corpus as the preferred remedy for unlawful pretrial detention, which is why the term virtually disappears from practice after the seventeenth century.
Why It Matters in Research
Researchers encountering this term in medieval or early modern English legal sources should treat it as an entry point into the pre-habeas corpus landscape of liberty protections. Several research traps apply:
First, indexing. Historical sources consistently redirect from odio et atia to de odio et atia. Black's (both editions), Rapalje & Lawrence, and Bouvier all present the short form only as a cross-reference. If a research catalog or digest indexes this term without the DE prefix, the underlying writ is the same document.
Second, the writ's temporal range. De odio et atia appears in Magna Carta-era sources and in Bracton. It was already falling into disuse by the time Coke was writing. A legal history source citing it as active practice is drawing on very early medieval material; a source treating it as obsolete is likely writing from the seventeenth century onward. Knowing which era the source addresses prevents misreading the procedural context.
Third, the phrase "odiosa et inhonesta non sunt in lege praesumenda" appears immediately after the writ description in both Black's editions. This is a separate maxim — "odious and dishonorable things are not to be presumed in law" — and is not part of the definition of the writ itself. The typographic proximity in older dictionary formats has caused researchers to conflate the writ with the maxim. They are independent.
Fourth, the connection to Reg. Orig. 133. Both Black's editions cite the Registrum Omnium Brevium (Register of Writs) for the writ's form. Researchers tracing the writ's exact procedural requirements should consult that source, not merely the dictionary entry.
Historical Dictionary Support
All four source dictionaries treat odio et atia as a stub or redirect, with substantive content appearing only under de odio et atia. Black's (1st and 2nd editions) contain the fullest dictionary descriptions, providing the procedural mechanism: the writ ran to the sheriff; an inquisition was conducted; a finding of innocence triggered a bail writ. Both editions cite Reg. Orig. 133. Rapalje & Lawrence and Bouvier offer only cross-references with no independent analysis.
The historical dictionaries agree on the writ's character as a pretrial liberty mechanism but do not address its relationship to habeas corpus, its decline, or its Magna Carta foundations — all of which are essential context that researchers must supply from treatise sources. The dictionary record here is notably thin relative to the historical significance of the writ.
The maxim fragment "Odiosa et inhonesta non sunt in le[ge praesumenda]" appearing in both Black's editions is a reproduction artifact from the original typesetting, where the maxim followed the writ definition in continuous text. It is not a definition of odio et atia.
Jurisdictional Note
De odio et atia was exclusively an English common law writ and has no American procedural counterpart. In American legal history, habeas corpus occupied the field from the colonial period. References to this writ in American sources are uniformly historical.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia: DE ODIO ET ATIA; HABEAS CORPUS (Historical Development); WRITS, PREROGATIVE