Koch studied under Carstens until 1797. Perhaps since his name started with "K", he thought his teacher's did as well. "J" was written differently back then by some.
This is a faithful photographic reproduction of a two-dimensional, public domain work of art. The work of art itself is in the public domain for the following reason:
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The author died in 1839, so this work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or fewer.
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Captions
Dante and Virgil in the Second Circle in Hell, pen, ink and watercolor on paper, 1823