C.J. Costenoble, the architect of the Cathedral and author of Deutsche Architektur und ihr Ursprung (1812), started working on the first estimates in February 1821. A few years earlier he had already been recommended by Schinkel for the restoration of Marienburg, although the works were later carried out by others. (11) In March 1822, he presented the General Directorate with a plan and some drawings for the restoration of the Cathedral, but this was not considered sufficient as a basis for the work. (12) At the same time, proposals were prepared also by another architect, C.A. Rosenthal, who was chosen to continue the project instead of Costenoble. During 1826 to 1828, an architectural painter C.G.A. Hasenpflug (1802-58) was commissioned by the King to prepare paintings of the Cathedral showing both its present condition and the intended appearance after the restoration. The building was here shown in a romantically idealized context, surrounded by trees, restored to its former appearance and later additions removed. It seems that Hasenpflug also contributed to the preparation of the restoration plans, and he may have been responsible for some of the drawings. (13)