Abstract
The paper focuses on the so-called problemata, a topic that has not yet evoked much scholarly interest. In the beginning of the 15th century, problemata regularly occurred in the quodlibetal handbooks of the Prague University masters alongside the usual quaestiones. The paper introduces a catalogue of problemata found in the quodlibetal handbooks of the Prague University masters active between 1400 and 1417, i.e. John Arsen of Langenfeld, Matthias of Knín, John Hus, Simon of Tišnov, and Procopius of Kladruby. Moreover, it provides a basic overview of how the individual authors of quodlibetal disputations formulated their problemata and the sources they used.