The County Palatine of Durham was a jurisdiction in the North of England, within which the bishop of Durham had rights usually exclusive to the monarch. It developed from the Liberty of Durham, which emerged in the Anglo-Saxon period. The gradual acquisition of powers by the bishops led to Durham being recognised as a palatinate by the late thirteenth century, one of several such counties in England during the Middle Ages. The county palatine had its own government and institutions, which broadly mirrored those of the monarch and included several judicial courts. From the sixteenth century the palatine rights of the bishops were gradually reduced, and were finally abolished in 1836. The last palatine institution to survive was the court of chancery, which was abolished in 1972.
The palatine included the contemporary ceremonial county of Durham except southern Teesdale, the parts of Tyne and Wear south of the Tyne, and had exclaves in Northumberland and North Yorkshire around the island of Lindisfarne and the settlements of Bedlington, Norham, and Crayke.