This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Bmam. Scan from Johann Christoph Brotze's book Sammlung verschiedner Lieflndischer Monumente Fronte des Rigischen Schloes an der Nordseite gegen die Citadelle Anno die Ansicht University of Latvia Academic Library acadlib lv Johann Christoph Brotze PDold Johann Christoph Brotze Drawings of Riga Castle