Question: Are Measure for Measure and Mathis der Maler both fictional?
Sentence (from "Mathis der Maler (opera)"): The work's protagonist, Matthias Grünewald, was an actual historical figure who flourished in that era, and whose art, in particular the Isenheim Altarpiece, inspired many creative figures in the early 20th century, including Joris-Karl Huysmans's novel "Là-bas".
Relevant evidence: No