Sanssouci Deep Plate from Rosenthal. This deep plate is part of the Sanssouci series, which was created year 1745 when Fredrik the Great got his new castle Sansoussi built in Potsdam. Fredrik wished for associated porcelain, and the result was this series with beautifully patterned edges that match the roof of the castle. The design has not changed since then, it is the same as today.