Definition
A Latin legal phrase meaning "at the costs" or "at the expense of." Used in historical pleadings, writs, and legal records to designate which party bears the costs of a proceeding or action. The phrase appears in several extended forms: *ad ejus propria custagia* ("at his own proper costs") and *ad propria onera et custagia partis* ("at the proper costs and charges of the party"), each specifying with greater particularity the burden of expense and who carries it.
Why It Matters in Research
This term is pure procedural Latin from the era of common law pleading and will appear almost exclusively in pre-19th century writs, records of the Court of Sewers, plea rolls, and formal pleading registers. Researchers encountering the phrase in primary sources need to read it as a cost-allocation marker — it signals which party was directed to bear litigation expenses or costs of enforcement, not the merits of the underlying claim.
The extended forms matter more than the base phrase. *Ad ejus propria custagia* was a formula used in writs to confirm that the party at whose instance process issued would be personally liable for the costs. *Ad propria onera et custagia partis* appears in specialized administrative and drainage law contexts, particularly in proceedings under the Commissioners of Sewers, where cost allocation among landowners and parties was a live and contested issue.
Researchers working in pre-Judicature Act English records, colonial American court records, or equity pleadings should treat any *custagia* variant as a signal to examine the surrounding procedural posture: who initiated the action, whether costs were contested, and whether any subsequent order addressed the allocation. The word *custagia* itself (see CUSTAGIA) is the operative noun and has its own dictionary treatment worth consulting for variant spellings and parallel constructions.
Modern cost-shifting concepts — fee-shifting statutes, cost awards under Rule 54 of the Federal Rules of Civil Procedure, and taxation of costs — descend conceptually from this tradition but use entirely different vocabulary. Tracing a historical cost-allocation dispute into modern legal categories requires recognizing that *ad custagia* belongs to a procedural world that no longer exists as such.
Historical Dictionary Support
Black's (both editions) and Bouvier agree exactly: the phrase means "at the costs," with authority attributed to Toullier, Cowell, and Whishaw. This unanimity reflects the phrase's unambiguous and narrow function — no dictionary felt the need to elaborate because the meaning was self-evident to a practicing common lawyer.
Burrill adds the most texture. He supplies the specific plea roll reference (Reg. Jud. 9a), the extended forms with their sources, and a cross-reference to CUSTAGIA — indicating that Burrill treated the custagia family of terms with systematic care. The Callis on Sewers citation (*ad propria onera et custagia partis*) is particularly useful because it grounds the phrase in a distinct administrative law context (drainage and sewer commissions) that other dictionaries miss entirely. Researchers in that area of historical English property and water law will find Burrill the more instructive source.
None of the historical dictionaries provide a common-law case citation for *ad custagia* in isolation, which suggests the phrase functioned as boilerplate Latin in standard forms rather than a term generating independent legal doctrine.