Definition
De sancto Johanne is a Latin phrase meaning "of Saint John" or "of the feast of Saint John." In legal usage, it appears primarily in connection with temporal references — specifically to the feast of Saint John the Baptist (June 24), one of the traditional quarter days of the medieval English calendar. The phrase functioned as a dating marker in writs, charters, and legal instruments, anchoring obligations, terms of tenure, rents, and procedural deadlines to a recognized feast day in the ecclesiastical and civil calendar.
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Common Language
This is a Latin phrase of ecclesiastical origin with no meaningful counterpart in modern common English usage. The COMMON LANGUAGE section is omitted.
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Why It Matters in Research
Researchers encountering de sancto Johanne in medieval legal instruments must recognize it first as a temporal or calendrical reference rather than a substantive legal concept. The feast of Saint John the Baptist (Midsummer, June 24) was one of the four principal quarter days used throughout medieval England for the calculation of rents, terms of service, lease periods, and legal deadlines. Confusing it with other feasts bearing the name John — most notably the feast of Saint John the Evangelist (December 27) — is an easy error that can throw off date calculations in historical documents by six months.
In the context of Bracton and Magna Carta (the two sources Burrill cites), the phrase is most likely encountered in passages governing temporal rights, tenure conditions, or procedural timelines. Bracton's extensive use of feast-day dating throughout De Legibus et Consuetudinibus Angliae requires researchers to maintain a reliable ecclesiastical calendar reference when working through his text. The folio reference (339b) places the Bracton use in sections dealing with procedural or property matters where timing was material to right.
Magna Carta chapter 9 (in its various regnal numberings) concerns debt and suretyship, and feast-day references in that context typically mark the dates on which obligations fell due or grace periods expired. The chapter 9 reference in the 9 Henry III confirmation (the 1225 reissue, which became the definitive text) is the version most frequently cited in legal sources.
The larger research trap is treating de sancto Johanne as a term with independent legal significance when it is functioning as a calendrical anchor. Its meaning is fully context-dependent: in a charter granting rent payable de sancto Johanne, it sets a payment date; in a writ, it may bound a return day or a term of notice. Neither function carries substantive legal doctrine of its own.
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Historical Dictionary Support
Burrill's entry for de sancto Johanne is one of the sparest in his dictionary — essentially a gloss ("St. John") followed by two bare citations to Bracton folio 339b and Magna Carta 9 Henry III, chapter 9. Burrill offers no further explanation, which itself signals that he treated the phrase as self-evident to his nineteenth-century audience, familiar with ecclesiastical calendar conventions that modern researchers may not share.
No other major historical legal dictionaries in the Law Mind corpus — not Jacob's Law Dictionary, not Tomlin's, not Bouvier — appear to carry a standalone entry for this phrase. This is consistent with its nature as a calendrical locution rather than a term of art: it was embedded in documents and in treatises like Bracton as a dating convention rather than as a legal concept requiring definition.
The absence of elaboration in historical sources is a useful data point: it confirms the phrase was functional and conventional, not contested or technical. Researchers should not expect doctrinal commentary on it.
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Jurisdictional Note
De sancto Johanne is specific to the English medieval legal tradition and the ecclesiastical calendar as applied in English law and practice. Scottish, Continental, and later common law sources used different calendrical systems and feast-day conventions; the phrase should not be assumed to carry identical reference in non-English documents without verification.
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