This paper analyses the Verlagsanzeige of the humanist, mathematician, astronomer and publisher Johannes Regiomontanus. How is humanism expressed in this famous document from German early printing and what is its relationship to philosophy? The article shows that Regiomontanus advocated a special form of humanism that went beyond the standard humanism that he valued, with ‘truth’ as its most important aspect. From the epistemological perspective of the history of philosophy in Regiomontanus’s publishing programme, the ‘truth’ of mathematics is seen, analogous to (...) some predecessors, as a paradigm of programmatic testimony. The integration of philosophy is evident in this, as in another specified way as well. (shrink)