His limited financial budget urged him to move from Limburg to Trier (Germany) where he joined the choir of the dome and continued his studies at the “Kollegium zum heiligen German”, founded there around the turn of the 15th century by the “Brothers of the mutual life”. It was this place where for the first time he discovered Greek signs and letters on ancient documents which interpretation and explanation fascinated him ever since. It is presumed that he was registered here as a member of the college. Unfortunately, little more is known about this period in Trier (Germany).

At the age of 16 Petrus Mosellanus left Trier in 1509 and proceeded to the University of Cologne. An inheritance of his grandfather Johann Schade from Cochem provided him with sufficient financial means to change to Cologne.