This can range from simple personal letters to complete legal documents and identity papers. This art involves carving the mirror image of a design onto a wooden or metal plate with a special tool, a graver.Being the keeper of the king's seal was an important duty; if it were stolen, people could forge documents in his name. I really can't find a reason someone would require forged identification or traveling papers, barring outright impersonation. Examining forged documents should not be seen as just determining the truth, because, as already suggested, there was a lot of gray area. You hand over the forged documents, exchanging only a few words; your masterful skill speaks for itself. In the late nineteenth and early twentieth centuries, the so-called Spanish Forger was responsible for a great number of fraudulent medieval manuscripts.