Who created the English common law by jury?

The English common law by jury was developed over time through the efforts of various legal reforms and court decisions, but it is primarily attributed to the Magna Carta of 1215, which established the principle that legal judgments should be made by a jury of peers. King John of England, under pressure from the barons, agreed to this foundational document, which laid the groundwork for the jury system. Subsequent legal developments, particularly during the reign of King Henry II in the 12th century, further codified and expanded the use of juries in the English legal system.