Early map from 1500s by Vopelius: https://gallica.bnf.fr/ark:/12148/btv1b53060646p/f1.item.zoom#
In the mid-16th century, the borders between the Electorate of Trier, the Duchy of Luxembourg, the Duchy of Lorraine, and the Kingdom of France were still partly disputed and unclear. There was no question of contiguous territories with clear borders as we know them today. The border regions were characterized by enclaves and exclaves. More or less successful attempts to straighten the borders were made in the second half of the 18th century, shortly before the French Revolution and its aftermath led to new states and new border demarcations.
The first border depiction for the study area can be found in Caspar Vopelius's Rhine map from 1555, with later editions from 1558 and 1560. shown in Figure 1. Names for landscapes and peoples from Roman times can be found alongside current names of rulers; in addition, the coats of arms of the Electorates of Trier, Luxembourg, and Lorraine, as well as the invented Westrich coat of arms, are shown.
Between Trier and Luxembourg, the border between the two territories can be seen as a dashed line; it runs to the right of the Moselle, crosses the Moselle again at the confluence with the Saar, and ends near Bitburg in the Eifel region.
See Technical Innovation and Spatial Abstraction: The Example of Early Maps of the Border Region between the Duchy of Luxembourg and the Electorate of Trier by Karl Solchenbach at the following link
https://slub.qucosa.de/api/qucosa%3A85037/attachment/ATT-0/