 On 4 January 1351 Archbishop Baldwin named Johann the chief "Amtmann" of the Trier lands on the right bank of the Moselle river.In 1356, Baldwin's successor, Boemund, entered a conflict with Johann and his brother-in-law Rupert I, Elector Palatine, about the toll near Enkirch.This feud was troublesome for many Trier locations because of the associated robbery and fire, but Boemund destroyed Starkenburg, Kirchberg, and cornered Sponheim in such a way that Johann had to sue for peace in 1360.