Definition
In old Roman and medieval English legal practice, *vocatio* is the act of calling or summoning a warrantor to defend title to land on behalf of a tenant who has been challenged in a real action. The term denotes both the procedural act of vouching — formally calling upon a third party to come forward and warrant title — and the relationship that act creates between the vouchee and the original tenant. It is the Latin root concept underlying the common-law process of voucher to warranty.
Why It Matters in Research
*Vocatio* is encountered almost exclusively in treatises on medieval English real property procedure, particularly in sources drawing on Bracton's *De Legibus et Consuetudinibus Angliae*. Researchers working in that corpus should treat the term as a technical pointer to voucher proceedings rather than a freestanding doctrine. Its appearances are largely glossary-level: Burrill cites *vocatio* and immediately redirects to *vocare*, signaling that the substantive doctrine is carried under that entry and its English-language descendants (voucher, warranty of land).
The principal research trap is conflating *vocatio* with *vocatio in jus*, the Roman law concept of summoning a party to appear before a magistrate — a distinct procedure with no direct counterpart in the common-law voucher context. Medieval treatise writers borrowed Roman vocabulary loosely, and a term appearing as *vocatio* in a Latinate source may carry either meaning depending on whether the surrounding text concerns Roman civil procedure or English real actions.
Because *vocatio* essentially drops out of legal usage after the decline of real actions in the sixteenth and seventeenth centuries, it will not appear in equity reports, modern statutory compilations, or post-Judicature Act materials. Its natural habitat is the Year Books, Bracton, Britton, and the Latinized sections of Fleta. Researchers encountering the term in a later source should treat that appearance as a deliberate archaism or scholarly quotation rather than live procedural usage.
Historical Dictionary Support
Burrill is the primary dictionary source and handles the term briefly: *vocatio* is glossed as "voucher; a calling to warrant," traced etymologically to *vocare* (to vouch), and pinned to Bracton folio 382b. Burrill adds no substantive elaboration beyond the cross-reference to *vocare*, which is consistent with the term's role as a Latin heading for a doctrine more fully developed elsewhere.
No major common-law dictionary — not Jacob's *Law Dictionary*, not Tomlin, not Bouvier — carries a standalone entry for *vocatio* in its English editions, which itself tells a research story: by the time English-language legal dictionaries were systematizing the common law, the term had receded entirely into historical and academic usage. Its presence in Burrill reflects his characteristically thorough treatment of Roman and civil-law Latin roots, not any ongoing practical currency.
The Bracton citation (fol. 382b) situates *vocatio* within the treatise's extended treatment of warrantia cartae and real actions — a section that legal historians have analyzed as Bracton's effort to reconcile English feudal practice with Roman procedural categories. Researchers consulting that passage should be aware that Bracton's *vocatio* is part of a broader analogical framework, not a direct transcription of English pleading practice.
Jurisdictional Note
*Vocatio* as a term of art belongs to the English common-law tradition as filtered through medieval Latin treatise writing. It has no recognized place in American common law as a term of practice. Civil-law jurisdictions using Roman procedural vocabulary may use *vocatio* in unrelated senses; materials from mixed-law or civilian systems should not be read against the Bracton-derived common-law meaning.