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In page Drenther Crusade:

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The County of Drenthe was a fief of the Holy Roman Empire belonging to the secular jurisdiction of the bishops of Utrecht.[1] It also fell within the bishops' spiritual jurisdiction as part of the archdeaconries of Deventer and Oldenzaal.[2] The inhabitants' dispute with the bishops primarily concerned the exercise of secular (not spiritual) authority. Bernard Slicher van Bath argued that the peasants, who were mostly freemen who owned their land and had their own organizations, feared that the bishops would reduce them to serfdom under the bishop as lord. F. H. J. Dieperink, on the other hand, has argued that they were mostly just opposed to compulsory payment of tithes and the governmental (not lordly) authority of the bishop.[3]