He received his degree of Baccalaureus artium in 1465 and acted as a priest in Vienna from 1473.
The finished work was exhibited in Klosterneuburg abbey as a richly illuminated parchment manuscript, the so-called Tabulae Claustroneoburgenses.
The manuscript was supplemented by a great triptych based on the Babenberg family tree, made by the workshop of Hans Part during the period c. 1489 to 1492, for the benefit of the pilgrims visiting Klosterneuburg (now in the monastery museum).
He was a member of the Sodalitas litteraria Danubiana ("Danubian literary society") in 1498.Emperor Maximilian charged Sunthaym with a major project, reviewing the genealogy of the House of Habsburg.
Sunthaym's geographical works, covering Austria, Bavaria, Swabia, the Alsace and parts of Franconia, are an important source for the economy and demographics of these regions at the end of the medieval period.