In criminal cases, witnesses acquainted with particular facts were added to the general assize of twelve men from each hundred and four men from each town. The assize then bifurcated into the grand jury of twelve to twenty-four men and the petty jury or jury of verdict of twelve men, which replaced ordeal, compurgation, and trial by combat as the method of finding the truth. The men of the petty jury as well as those of the grand jury were expected to know or to acquaint themselves with the facts of the cases. The men of the petty jury tended to be the same men who were on the grand jury.
Felony included such crimes as homicide, arson, rape, robbery, burglary, and larceny. Murder still meant secret homicide. Burglary was an offense committed in times of peace and consisted of breaking into churches, houses, and into the walls and gates of villages and boroughs. These six offenses could be prosecuted by indictment or private accusation by an individual. The penalties involved loss of life or limb or outlawry; a felon's goods were confiscated by the crown and his land was forfeited to the crown for a year and a day, after which it escheated to the felon's lord. The peace of the king now did not die with the king, but renewed automatically without an interval before the inauguration of a new king.
Notorious felons who would not consent or put themselves on inquests for felonies with which they were charged at royal courts were put in strong and hard imprisonment to persuade them to accept trial by assize. This inducement progressed into being loaded with heavy chains and placed on the ground in the worst part of the prison and being fed a only little water one day and a little bread the next. Sometimes pieces of iron or stones were placed one another onto their prone bodies to persuade them to plead. This then developed into being loaded with as much iron as could be borne, and finally into being pressed to death ["peine forte et dure">[. Many of these men chose to die by this pressing so that their families could inherit their property, which would have been forfeited if they had been convicted of serious crimes.
The most common cases in the Court of Common Pleas were "detinue" [wrongful detention of a good or chattel which had been loaned, rented, or left for safekeeping with a "bailee", but belonged to the plaintiff], "debt" [for money due from a sale, for money loaned, for rent upon a lease for years, from a surety, promised in a sealed document, or due to arbitrators to whom a dispute had been submitted] and "account" [e.g. against bailiffs of manors, a guardian in socage, and partners]. It also heard estovers of wood, profit by gathering nuts, acorns, and other fruits in wood, corody [allowance of food], yearly delivery of grain, toll, tunnage, passage, keeping of parks, woods, forests, chases, warrens, gates, and other bailiwicks, and offices in fee.
The itinerant justices gradually ceased to perform administrative duties on their journeys because landed society had objected to their intrusiveness. Edward I substituted regular visitations of justices of assize for the irregular journeys of the itinerant justices. Each one of four circuits had two justices of assize. From about 1299, these justices of assize heard cases of gaol delivery. Their jurisdiction expanded to include serious criminal cases and breach of the king's peace.
Breaches of the forest charter laws were determined by justices of the King's forest, parks, and chases, along with men of assize.
Coroners' inquest procedures were delineated by statute and included describing in detail in the coroner's rolls every wound of a dead body, how many may be culpable, and people claiming to have found treasure who might be suspects.
The precedent for punishment for treason was established by the conviction of a knight, David ab Gruffydd, who had turned traitor to the Welsh enemy, after fighting with Edward and being rewarded with land, during the conquest of Wales. He had plotted to kill the King. He was found guilty of treason by Parliament and condemned to be dragged at the heels of horses for being a traitor to his knightly vows, hanged by the neck for his murders, cut down before consciousness left him to have his entrails cut out for committing his crimes during the holy week of Easter, and his head cut off and his body divided into four parts for plotting against the King's life. The head was placed on the Tower of London and his body sections were placed in public view at various other locations in England. This came to be known as "hanging, drawing, and quartering". Prior to this the penalty had been imprisonment, usually followed by ransom.
Trial by combat is now limited to certain claims of enfeoffment of large land holding and is barred for land held in socage, burgage, or by marriage. Assize is the usual manner of trial, but compurgation remains in the borough court long after it becomes obsolete in the royal courts. Defendants no longer request assizes but are automatically put to them.
Numerous statutes protect the integrity of the courts and King's offices by double and treble damages and imprisonment for offenses such as bribery, false informers, conspiracy to falsely move or maintain pleas, champerty [covenant between a litigant and another for the other to have a part or profit in the award in return for maintaining the suit], conflict of interest by court officers taking part in a quarrel pending in court or working any fraud whereby common right may be delayed or disturbed. There had been many abuses, the most common of which was extortion by sheriffs, who gaoled people without cause to make them pay to be released. The 1275 prohibition of maintenance of a quarrel of a party in court by a nonparty was extended in 1327 to all persons, including the king's councilors and ministers, and great men, e.g. by sending letters. In 1346, this prohibition specifically included prelates, earls, barons taking in hand quarrels other than their own, or maintaining them for gift, promise, amity, favor, doubt, or fear, in disturbance of law and hindrance of right. The reason given was that there had been persons disinherited, delayed or disturbed in their rights, and not guilty persons convicted or otherwise oppressed. All great men were required to put out of their service all maintainers who had been retained, and void their fees and robes, without giving them aid, favor, or comfort. This law was not obeyed.