Jan Janssonius | |
|---|---|
| Born | 1588 |
| Died | 11 July 1664 |
| Occupations |
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| Scientific career | |


Johannes "Jan" Janssonius (1588, in Arnhem – buried 11 July 1664, Amsterdam), also known in English as Jan Jansson, was a Dutch cartographer and publisher, who lived and worked in Amsterdam in the 17th century. He is regarded as one of the notable figures in the Golden Age of Dutch cartography (c. 1570s–1670s), continuing the work of his famous father-in-law Jodocus Hondius.
Janssonius was born in Arnhem in 1588, the son of Jan Janszoon the Elder, a publisher and bookseller.
In 1612, at the age of 24, he married Elisabeth de Hondt, the daughter of famous cartographers Jodocus Hondius and Colette van den Keere. His wife Elisabeth died in 1627, and he married Elisabeth Carlier two years later in 1629. He worked in the family business of his parents-in-law, along with his brothers-in-law, the cartographers Henricus Hondius II and Jodocus II.
He published his first maps, of France and Italy, in 1616.
By about 1623, Janssonius had begun acquiring bookstores in several European cities, including Frankfurt am Main, Danzig, Stockholm, Copenhagen, Berlin, Königsberg, Geneva, and Lyon. These bookshops operated alongside his publishing activities and provided outlets for the distribution of his maps and atlases.
From about 1630 to 1638 he was in partnership with his brother-in-law Henricus Hondius II, and together they issued new editions of the Mercator–Hondius atlases under the name Mercator/Hondius/Janssonius.
Under Janssonius, the Hondius atlas project was steadily expanded. The work developed into a large multi-volume atlas that later became known as Atlas Maior. By 1660, it consisted of eleven volumes and included contributions from about one hundred credited authors and engravers.
Additional volumes were issued as the series grew. These included works devoted to maritime geography, the ancient world, and collections of city views and plans. One of these was the Atlas Maritimus, a maritime atlas published in 1657. Janssonius also issued an extensive atlas of city plans, often referred to as a Townatlas.
The final volume of the series was a celestial atlas created by the German-Dutch cartographer Andreas Cellarius. Published in 1660, it formed the eleventh volume of Atlas Maior.
Janssonius died in 1664. After his death the publishing business continued through his heirs and associates, including his son-in-law Johannes van Waesbergen.

{{Cite Q}}: Missing first/last names in Wikidata for Pieter van den Keere {{cite web}}: CS1 maint: periodical has ISBN (link)