To these:  You assert that these tithes are rightfully yours, nevertheless the thirty year objection [prescription] imposes silence on you.  All possession is annulled by thirty or forty year prescriptions of religious houses or one hundred years for the lands of the holy Roman church.  Whence Pope Gelasius:

Facultates ecclesie necnon et dioceses que ab aliquibus possidentur episcopis, iure sibi uendicent quod tricennalis lex conclusit. Quia et filiorum nostrorum principum ita emananuit auctoritas ut ultra triginta annos nulli liceat pro eo appellare quod legum tempus exclusit.