architect and master builder Adam Franz Friedrich Leydel (1783-1838)
Johann Baptist Joseph Bastiné (1783-1844)
circa 1818 <div style="display: none;">date QS:P,+1818-00-00T00:00:00Z/9,P1480,Q5727902</div>
Aachener Kunstblätter Heft XIV, Original in <a href="//commons.wikimedia.org/wiki/Couven_Museum" title="Couven Museum">Couven Museum</a>, Aachen