The Hildesheim Diocesan Feud[1] (German: Hildesheimer Stiftsfehde) or Great Diocesan Feud,[2] sometimes referred to as a "chapter feud",[3][4] was a conflict that broke out in 1519 between the Prince-Bishopric of Hildesheim (Hochstift Hildesheim) and the principalities of Brunswick-Wolfenbüttel and Calenberg that were ruled by the House of Welf. Originally just a local conflict between the Hildesheim prince-bishop John IV of Saxe-Lauenburg and his own prince-bishopric's nobility (Stiftsadel), it developed into a major dispute between various Lower Saxon territorial princes. The cause was the attempt by Prince-Bishop John to redeem the pledged estates and their tax revenue from the nobles in his temporalities, the prince-bishopric (Hochstift, or simply das Stift). The diocesan feud ended with the Treaty of Quedlinburg in 1523.[5]