Ludewig Suhl may be the only person ever to depict the duke. The duke and the following Death was cut out and disappeared, when a gateway was expanded in the church wall in 1799. When Hauttmann, the brothers Borchers, Tiedemann, Robert Geißler and Thomas King show the duke, they have presumably copied Suhl. Where else would they have seen the duke?
The picture to the left shows the door as it looked December 2001. Above the door one can see the new stained glass windows from 1952-56. The picture to the right is from a coloured exemplar of Suhl's engraving. I don't know whether the colouring happened before 1799.
Notice that the duke and the following Death are not holding hands. The duke holds a flag and Death uses both hands to catch the abbot. This is because there's always been a (smaller) door between the duke and Death and they have always been on two separate canvasses. When the door was enlarged, it was necessary to remove them both.
XIV. Death to the General
XV. The General's answer.