One clue that the castle described in the poem is actually Burg Bishofstein comes from a torn piece of parchment written by historian Browner in 1670 which references the poem's title "De castello Bischofstein super Mosellam aB. Nicetio extrueto". The validity of this parchment was already being debated in the mid 18th century by historian and auxiliary bishop Johann Nikolaus von Hontheim. The actual location of the Castle of Nicetius is unknown, but it is accepted that it is somewhere in the Kobern region of Germany. In any case, it is no longer accepted as the precursor for Burg Bischofstein.
