Career
Schoenberg (died: 26 September 1517 in Zeitz) was from 1492 to 1517 Bishop of Naumburg-Zeitz. John III studied at the University of Leipzig, and in Cologne. He was dean of Magdeburg, a canon of Meissen, provost at Bautzen and then magister scholarum of the cathedral chapter in Meissen.
Pope Innocent VIII appointed him bishop, even though the cathedral chapter objected.
The lucrative silver mining at Schneeberg continued. There indications that he may have been temporary mentally "confused" towards the end of his life.
In 1511 the chapter proposed to appoint canon Vincent of Schleinitz as coadjutor, but the House of Wettin saw to it that their candidate Philip of the Palatinate was appointed instead. John III died in 1517 and was buried in Naumburg Cathedral.
A bronze plaque of his tomb has survived.
