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De Wit (1629 ca.-1706) was a mapmaker and mapseller who was born in Gouda but who worked and died in Amsterdam. He moved to the city in 1648, where he opened a printing operation under the name of The Three Crabs; later, he changed the name of his shop to The White Chart. From the 1660s onward, he published atlases with a variety of maps; he is best known for these atlases and his Dutch town maps. After Frederik’s death in 1706, his wife Maria ran the shop for four years before selling it. Their son, Franciscus, was a stockfish merchant and had no interest in the map shop. At the auction to liquidate the de Wit stock, most of the plates went to Pieter Mortier, whose firm eventually became Covens & Mortier, one of the biggest cartography houses of the eighteenth century.

Covens & Mortier was one of the largest and most successful publishing firms in Dutch history and continued in business for over a century. Pierre Mortier the Elder (1661-1711) had obtained a privilege in 1690 to distribute the works of French geographers in the Netherlands. After his widow continued the business for several years, Cornelis (1699-1783) took over in 1719.

In 1721, Mortier forged a partnership with Johannes Covens (1697-1774), who had recently married Cornelis’ sister. They published under the joint name of Covens & Mortier. In 1774, upon the death of his father, Johannes Covens II (1722-1794) took over his father’s share. In 1778, the company changed its name to J. Covens & Zoon, or J. Covens & Son.

Covens II’s son, Cornelis (1764-1825), later inherited the business and brought Petrus Mortier IV back into the fold. Petrus was the great-grandson of Petrus Mortier I. From 1794, the business was called Mortier, Covens & Zoon, or Mortier, Covens, & Son.

The business specialized in publishing French geographers including Deslisle, Jaillot, Janssonius, and Sanson. They also published atlases, for example a 1725 reissue of Frederik de Wit’s Atlas Major and an atlas, with additions, from the works of Guillaume Delisle. There were also Covens & Mortier pocket atlases and town atlases. The company profited from acquiring plates from other geographers as well. For example, the purchased Pieter van der Aa’s plates in 1730. Finally, they also compiled a few maps in house. At their height, they had the largest collection of geographic prints ever assembled in Amsterdam.