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In page Olędrzy:

"

In return for tenure of the land, the settler paid the land owner the so-called wkupne (also called the gottespfenik)[Note 2] While in Royal Prussia and Kuyavia the wkupne had to be paid before the first assumption of tenure, and also at each subsequent extension, in Greater Poland Olęder settlers paid the land owner the so-called Gruntgeld only upon converting tenure for a term of years into tenure in perpetuity.[7]