Jan Janssonius, real name Jan Janszoon, was a Dutch cartographer, printer and publisher. He built the publishing house of his father-in-law, Jodocus Hondius, into one of the largest in Europe. With his brother-in-law Henricus Hondius ( 1597 – 1651), real name Joost de Hondt and Dutch cartographer, he had a partnership until 1638.
- illustration: beautiful hand-colored map of the principality that was just north of Lyon. The principality existed for five centuries. From the Atlas Novus, Sive Theatrum Orbis Terrarum: In quo Galliae, Helvetiae, Italiae et Hispaniae, published in 1656-1657
- year: 1656
- quality: excellent
- signed: no
- image size: 38.0 x 48.9 cm | 15.0 x 19.3 in (h x w)
- sheet or frame size: 47.2 x 57.0 cm | 18.6 x 22.4 in (h x w)
