Definition
In damno is a Latin phrase from medieval legal Latin meaning "in damage" or "in the act of doing damage." It appears primarily in common law pleading and property contexts to describe a trespassing animal or person caught in the act of causing harm to another's land or goods. The phrase is closely associated with distress law, where a party's right to seize or impound another's cattle or livestock was often conditioned on the animals being found in damno — that is, actively trespassing and causing damage on the claimant's land at the moment of taking.
Why It Matters in Research
Researchers will encounter in damno most frequently in medieval and early common law materials concerning distress, pound, and cattle trespass. The phrase functions as a condition precedent in those contexts: the lawfulness of an impoundment or distraint often turned on whether the animals were taken while actually causing damage, not merely found wandering on the land after the fact.
The principal trap for the historical researcher is treating in damno as a standalone doctrine rather than recognizing it as a qualifying phrase embedded within larger rules about distress damage feasant. Sources that discuss "damage feasant" — the right to distrain a thing causing damage — are the substantive home of this concept; in damno is the shorthand used in Latin-register pleading and treatise writing to express that same condition. Researchers who search only for the Latin form will miss the bulk of the relevant English-language material organized under "damage feasant."
Bracton's De Legibus et Consuetudinibus Angliae (folio 158, as cited by Burrill) is the primary classical source. Because Bracton writes in Law Latin, in damno appears there as a natural register marker rather than a term of art requiring special gloss. Later common law treatise writers who translated or summarized Bracton typically render the concept in English as "doing damage" or "damage feasant" without preserving the Latin phrase. This means the term's documentary trail narrows sharply after the medieval period.
Historical Dictionary Support
Burrill's Law Dictionary gives only a brief treatment: "In damage; doing damage. Bract. fol. 158. See Damnum." The cross-reference to Damnum is the substantive pointer — Burrill treats in damno as a phrase-form derivative of the broader concept of legal harm (damnum), not as an independent doctrine. The brevity of the entry reflects the phrase's function: it is a pleading marker, not a rule in itself.
No other major historical dictionaries in the standard shelf (Bouvier, Black, Tomlin) develop a separate entry for in damno, treating the concept instead under damage feasant or distress. This gap confirms that the phrase belongs to the Latin-register layer of common law literature and was largely absorbed into English-language doctrine without carrying the Latin term forward.