Definition
A Latin term meaning "master." In classical Roman law and in the common law tradition as received through Blackstone, herus denotes the master in a master-and-servant relationship — the party who directs labor and owes wages or compensation in exchange. The term appears almost exclusively in Latin maxims and formulaic phrases used to illustrate the structure of bilateral obligations arising from service contracts.
The term is inseparable from two canonical Latin phrases drawn from Blackstone's analysis of contracts:
1. Servus facit ut herus det — "The servant does [the work] in order that the master may give [him the wages agreed on]." This formulation describes the servant's side of the exchange: labor performed in expectation of compensation.
2. Herus dat ut servus faciat — "The master gives [or agrees to give] the wages, in consideration of, or with a view to, the servant's doing [the work]." This formulation describes the master's side: the promise or payment of wages made in anticipation of labor rendered.
Together, these phrases were used by Blackstone to illustrate the category of contracts in which one party performs an act so that the other will give something in return — a do ut facias / facio ut des structure — distinguishing them from simple gift, sale, or barter.
Common Confusion
Herus should not be confused with dominus, another Latin term for "lord" or "master" that appears throughout feudal and property law. Dominus carries broader connotations including ownership of property and lordship over land; herus is narrower, referring specifically to the master in a personal service relationship. Researchers encountering dominus in real property or feudal tenure contexts are in a different doctrinal neighborhood than those encountering herus in contract or labor contexts.
Why It Matters in Research
Herus is not a term of art with independent legal force in modern common law — it will not appear in statutes, modern cases, or contemporary secondary literature. Its significance to corpus researchers is almost entirely historical and contextual: the term functions as a marker for classical contract theory as filtered through Blackstone, specifically his taxonomy of bilateral obligations in Book II of the Commentaries.
Researchers working in early contract law, master-and-servant doctrine, or the civil law foundations of common law obligations should treat herus as a signal that the surrounding text is engaging with Romanist analytical frameworks. Finding herus in a historical source suggests the author is working within a learned, Latinate tradition rather than purely from English common law authority.
The two maxims citing herus appear in Blackstone's Commentaries at 2 Bl. Comm. 445 and are reproduced nearly verbatim across all four source dictionaries — an unusual degree of uniformity that reflects how narrowly the term's use was circumscribed even in the historical literature. No source dictionary offers a use of herus outside these two paired maxims, suggesting the term had no broader circulation in English legal writing beyond this one illustrative passage.
For researchers tracing the development of consideration doctrine or the theory of bilateral contracts in early American and English law, the herus/servus pairing is a useful lens into how classical Roman contract categories (specifically the innominate contracts) were absorbed and adapted. Blackstone's use of these maxims was itself part of a broader effort to systematize English contract law along civilian lines.
Historical Dictionary Support
All four source dictionaries — Black's (1st and 2nd editions), Burrill's, and Bouvier's — offer substantively identical entries. Each defines herus as "a master," each reproduces the same two Latin maxims, and each cites 2 Bl. Comm. 445 as the sole authority. The consistency is notable and suggests that none of the compilers identified additional case law, statutory usage, or secondary authority beyond Blackstone to enrich the entry. This uniformity is itself informative: herus was apparently understood even by 19th-century legal lexicographers as a term whose entire legal significance was contained within Blackstone's use of it.
Minor textual variation exists across editions — Bouvier uses faciat where Black's and Burrill use facit in the second maxim, reflecting a grammatically more precise subjunctive in Bouvier — but this difference carries no substantive legal significance.
No source dictionary attempts to trace herus into English case law or statutory authority, which is consistent with the term's function as illustrative Latin rather than operative legal vocabulary.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Master and Servant; Contracts, Bilateral; Consideration, Doctrine of