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How did a subpoena work in Chancery proceedings?

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King Henry II and St. Thomas Becket — Common law Henry II (left) disputing with Thomas Becket (center), miniature from a 14th-century manuscript; in the British Library (Cotton MS. Claudius D.ii).

In the context of the Court of Chancery, the subpoena served as a critical procedural tool to initiate legal action. Contrary to the idea that Chancery proceedings were purely informal, the process was structured around the plaintiff presenting a bill in the vernacular language, after which the defendant was summoned via a writ of subpoena.1

The primary function of this subpoena was to compel the defendant to appear before the lord chancellor or one of his subordinates for personal questioning. This allowed the court to examine the case on its merits, addressing issues such as fraud or breach of confidence that the rigid common law courts often failed to remedy.12

The authority of the subpoena was strictly enforced: if a defendant refused to appear or failed to satisfy the chancellor's decree, they were subject to imprisonment. This mechanism was essential in establishing the chancellor's equitable jurisdiction, eventually leading to the development of a formal system of written pleadings as defendants filed their answers to these summonses.1