Origin Long-standing English equity doctrine; formulated by the US Supreme Court in Costello v. United States (1961).
Laches is an equitable defense in common law legal systems under which a claim for relief, particularly an equitable remedy such as an injunction, may be barred because the plaintiff unreasonably delayed in bringing it and that delay prejudiced the party asserting the defense. The term derives from Old French lachesse, meaning remissness or dilatoriness, and the doctrine reflects the maxim that equity aids the vigilant, not those who sleep on their rights; the United States Supreme Court in Costello v. United States (1961) described it as a lack of diligence by the party against whom the defense is asserted combined with prejudice to the party asserting it. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
Facts
Origin PeriodLong-standing English equity doctrine; formulated by the US Supreme Court in Costello v. United States (1961). 1 Core PrincipleA party who unreasonably delays in asserting a right, to the prejudice of the party against whom relief is sought, may be barred from obtaining that relief, particularly an equitable remedy. 1 Origin Period
Origin Period (category)20th Century (1900-1999) 1 Classification
Doctrine Category Connections
Associated With
Both are equitable/time-based limits: Adverse Possession vests title after prolonged open possession, Laches bars stale equitable claims.
In Area Of Law
Entity-backed identity for the doctrine category value this doctrine already carries as an enum fact, resolved to a doctrine entity by an explicit value-to-entity map (phase 3 bucket conversion, docs\design_entity_backed_browse_buckets_20260928.md). The enum fact itself stays on the entity unchanged.
In Legal System
Source Laches (Equity) (Wikipedia)
Sources
1. Laches (Equity) (Wikipedia)
WikipediaDefinition section, quoting Costello v. United States (1961)
Lack of diligence by the party against whom the defense is asserted combined with prejudice to the party asserting the defense.
- In Legal System: Common Law
View the Source 2. Wikipedia: Laches
Laches (equity), an equitable principle in Anglo-American lawView the Source Frequently Asked Questions
What must be shown for laches to bar a claim?
An unreasonable delay in bringing the action that prejudices the defendant.
Laches is a lack of diligence and activity in making a legal claim, or moving forward with legal enforcement of a right, particularly in regard to equity. It requires a delay in bringing the action, a delay that is unreasonable and that prejudices the defendant.
How is laches different from a statute of limitations?
A statute of limitations counts time only; laches asks whether the delay was reasonable in the case.
A statute of limitations is concerned only with the time that has passed. Laches is concerned with the reasonableness of the delay in a particular situation and so is more case-specific and more focused on the equitable conduct of the plaintiff.
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