Trial by ordeal was an ancient judicial practice by which the guilt or innocence of the accused was determined by subjecting them to a painful, or at least an unpleasant, usually dangerous experience. The test was one of life or death and the proof of innocence was survival. In some cases, the accused was considered innocent if they escaped injury or if their injuries healed.
In medieval Europe, like trial by combat, trial by ordeal was considered a judicium Dei: a procedure based on the premise that God would help the innocent by performing a miracle on their behalf. The practice has much earlier roots, attested to as far back as the Code of Hammurabi and the Code of Ur-Nammu.
In pre-modern society, the ordeal typically ranked along with the oath and witness accounts as the central means by which to reach a judicial verdict. Indeed, the term ordeal, Old English ordǣl, has the meaning of "judgment, verdict" (German Urteil, Dutch oordeel), from Proto-Germanic *uzdailjam "that which is dealt out".
Priestly cooperation in trials by fire and water was forbidden by Pope Innocent III at the Fourth Lateran Council of 1215 and replaced by compurgation. Trials by ordeal became rarer over the Late Middle Ages, but the practice was discontinued only in the 16th century.
Ordeal by combat took place between two people in a dispute. They or, under certain conditions, a designated "champion" would fight, and the loser of the fight or the party represented by the losing champion was deemed guilty or liable.
A notable case was that of Gero, Count of Alsleben, whose daughter married Siegfried II, Count of Stade.
Ordeal by fire was one form of torture. Ordeal of fire typically required that the accused walk a certain distance, usually 9 feet (2.7 metres) over red-hot ploughshares or holding a red-hot iron. Innocence was sometimes established by a complete lack of injury, but it was more common for the wound to be bandaged and re-examined three days later by a priest, who would pronounce that God had intervened to heal it, or that it was merely festering—in which case the suspect would be exiled or put to death. One famous story about the ordeal of ploughshares concerns Edward the Confessor's mother, Emma of Normandy. According to legend, she was accused of adultery with Bishop Ælfwine of Winchester, but proved her innocence by walking barefoot unharmed over burning ploughshares.