Jan Moretus

Printer's mark of Jan I Moretus, found in Henricus Sedvlius, Præscriptiones adversvs hæreses, Openbare Bibliotheek Brugge 1875a (f. *1 recto)

Jan Moretus, also John Moerentorf or Joannes Moretus (2 May 1543 – 22 September 1610), was a Flemish printer who was an apprentice for Christophe Plantin, married his daughter, and later inherited the printing business on his father-in-law's death.

Biography Moretus was born in Antwerp, the son of satin-weaver Jacob Mourentorf and Adriana Gras, daughter of Pieter Gras, a silk-weaver from Milan. He worked in Venice, starting around 1562 to 1563, and then returned to Plantin's business in Antwerp by 1565. Christophe wrote a letter on 5 November 1570 to Gabriel de Çayas (secretary to Philip II of Spain) about his new son-in-law:

quote|A young man quite expert in and with a good understanding of Greek, Latin, Spanish, Italian, French, German, and Flemish who from the time that your Highness was in this country with His Majesty until now, has always served me in both good and bad times, without abandoning me because of any ill-fortune which overtook me or because of the promises or inducements that others were able to make him, even offering him the richest marriages and rewards such as were not within my power to grant him. For which reason I give her [i.e. Martina] to him, to the great pleasure of all my good Lords, relations and friends who have known this young man while he has been conducting the business of my shop. Under his management, the company focused on 12mo format for text books, doing away with the smaller handbook (enchiridion) favored under his predecessor.

His wife, considered a formidable businesswoman from the wealthy bourgeoisie, Plantin, through her marriage to Moretus, was considered to be the head of the printing dynasty that lasted for more than three centuries. He has also collaborated with theologians in the publication of religious texts. For example, he worked with the Flemish scholar Henricus Sedulius during the publication of Bonaventure's The Life of St. Francis (De vita s. patris Francisci).

Moretus' works and archives are held in the Plantin-Moretus Museum in Antwerp.