How did juries develop in medieval England?

The development of the jury in medieval England was a gradual process that transformed the institution from a group of local witnesses into a body tasked with determining facts based on evidence.1

Origins and Early Development

The exact origins of the jury are debated; it may have been indigenous to England or introduced by the Normans in 1066. Initially, jurors were local notables who provided judgments based on their own personal knowledge of the facts.12

Administrative Reforms

King Henry II played a pivotal role in formalizing these procedures to centralize royal authority. Key developments included:2
* The Assize of Clarendon (1166): This established the "jury of presentment" (or grand jury), consisting of 12 men from each hundred and four from each township, who were required to report suspected criminals to royal judges.32
* Possessory Assizes: Henry II introduced writs such as Novel Disseisin to resolve land disputes, which utilized sworn local juries to establish facts regarding recent dispossession.2

Transition from Nonrational Trials

During the Middle Ages, legal disputes were often settled through "nonrational" modes of trial, such as trial by ordeal or battle. Following the Fourth Lateran Council in 1215, the use of ordeals declined and was eventually replaced by the jury system. By the 15th century, the jury had become the established method for determining verdicts in both criminal and civil cases at common law.214