The Casimirianum is a Renaissance building designed and built by Peter Sengelaub.
From the Bewiddungsbrief (Letter of Evaluation) of Duke Johann Casimir, the Foundation Charter of the Casimirianum, dated 3 July 1605: "Undoubtedly, in the view of these regulations and foundation of our school, the praeceptores [Latin, "teachers"] held truly and abundantly, and the public lectures multiplied.